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Factors of 165: Prime Factorization, Methods, and Examples
The number 165 is an odd number that is the multiple of 5 as well. All the numbers that can be easily divided by 165 without leaving any residue are called factors of the number 165.
The factors of the given number can be positive as well as negative provided that the given number is achieved upon multiplication of two-factor integers.
Factors of 165
Here are the factors of number 165.
Factors of 165: 1, 3, 5, 11, 15, 33, 55, 165
Negative Factors of 165
The negative factors of 165 are similar to its positive factors, just with a negative sign.
Negative Factors of 165: -1, -3, -5, -11, -15, -33, -55, -165
Prime Factorization of 165
The prime factorization of 165 is the way of expressing its prime factors in the product form.
Prime Factorization: 3 x 5 x 11
In this article, we will learn about the factors of 165 and how to find them using various techniques such as upside-down division, prime factorization, and factor tree.
What Are the Factors of 165?
The factors of 165 are 1, 3, 5, 11, 15, 33, 55, and 165. All of these numbers are the factors as they do not leave any remainder when divided by 165.
The factors of 165 are classified as prime numbers and composite numbers. The prime factors of the number 165 can be determined using the technique of prime factorization.
How To Find the Factors of 165?
You can find the factors of 165 by using the rules of divisibility. The divisibility rule states that any number, when divided by any other natural number, is said to be divisible by the number if the quotient is the whole number and the resulting remainder is zero.
To find the factors of 165, create a list containing the numbers that are exactly divisible by 165 with zero remainders. One important thing to note is that 1 and 165 are the 165’s factors as every natural number has 1 and the number itself as its factor.
1 is also called the universal factor of every number. The factors of 165 are determined as follows:
\[\dfrac{165}{1} = 165\]
\[\dfrac{165}{3} = 55\]
\[\dfrac{165}{5} = 33\]
\[\dfrac{165}{11} = 15\]
\[\dfrac{165}{165} = 1\]
The quotients, as well as the divisors, are considered as the factors of 165. Therefore, 1, 3, 5, 11, 15, 33, 55, and 165 are the factors of 165.
Total Number of Factors of 165
For 165 there are 8 positive factors and 8 negative ones. So in total, there are 16 factors of 165.
To find the total number of factors of the given number, follow the procedure mentioned below:
- Find the factorization/prime factorization of the given number.
- Demonstrate the prime factorization of the number in the form of exponent form.
- Add 1 to each of the exponents of the prime factor.
- Now, multiply the resulting exponents together. This obtained product is equivalent to the total number of factors of the given number.
By following this procedure the total number of factors of 165 is given as:
Factorization of X is 1 x 3 x 5 x 11.
The exponent of 1, 3, 5, and 11 is 1.
Adding 1 to each and multiplying them together results in 16.
Therefore, the total number of factors of 165 is 16. 8 are positive and 8 factors are negative.
Important Notes
Here are some important points that must be considered while finding the factors of any given number:
- The factor of any given number must be a whole number.
- The factors of the number cannot be in the form of decimals or fractions.
- Factors can be positive as well as negative.
- Negative factors are the additive inverse of the positive factors of a given number.
- The factor of a number cannot be greater than that number.
- Every even number has 2 as its prime factor, the smallest prime factor.
Factors of 165 by Prime Factorization
The number 165 is a composite. Prime factorization is a useful technique for finding the number’s prime factors and expressing the number as the product of its prime factors.
Before finding the factors of 165 using prime factorization, let us find out what prime factors are. Prime factors are the factors of any given number that are only divisible by 1 and themselves.
To start the prime factorization of 165, start dividing by its smallest prime factor. First, determine that the given number is either even or odd. If it is an even number, then 2 will be the smallest prime factor.
Continue splitting the quotient obtained until 1 is received as the quotient. The prime factorization of 165 can be expressed as:
165 = 3 x 5 x 11
Factors of 165 in Pairs
The factor pairs are the duplet of numbers that when multiplied together result in the factorized number. Factor pairs can be more than one depending on the total number of factors of the given numbers.
For 165, the factor pairs can be found as:
1 x 165 = 165
3 x 55 = 165
5 x 33 = 165
11 x 15 = 165
The possible factor pairs of 165 are given as (1, 165), (3, 55), (5, 33), and (11, 15).
All these numbers in pairs, when multiplied, give 165 as the product.
The negative factor pairs of 165 are given as:
-1 x -165 = 165
-3 x -55 = 165
-5 x -33 = 165
-11 x -15 = 165
It is important to note that in negative factor pairs, the minus sign has been multiplied by the minus sign due to which the resulting product is the original positive number. Therefore, -1, -3, -5, -11, -15, -33, -55, and -165 are called negative factors of 165.
The list of all the factors of 165 including positive as well as negative numbers is given below.
Factor list of 165: 1, -1, 3, -3, 5, -5, 11, -11, 15, -15, 33, -33, 55, -55, 165, and -165
Factors of 165 Solved Examples
To better understand the concept of factors, let’s solve some examples.
Example 1
How many factors of 165 are there?
Solution
The total number of Factors of 165 is 8.
Factors of 165 are 1, 3, 5, 11, 15, 33, 55, and 165.
Example 2
Find the factors of 165 using prime factorization.
Solution
The prime factorization of 165 is given as:
165 $\div$ 3 = 55
55 $\div$ 5 = 11
11 $\div$ 11 = 1
So the prime factorization of 165 can be written as:
3 x 5 x 11 = 165