Q: What is the prime factorization of the number 155,134,440?

 A:
  • The prime factors are: 2 x 2 x 2 x 3 x 3 x 3 x 3 x 5 x 47,881
    • or also written as { 2, 2, 2, 3, 3, 3, 3, 5, 47,881 }
  • Written in exponential form: 23 x 34 x 51 x 47,8811

Why is the prime factorization of 155,134,440 written as 23 x 34 x 51 x 47,8811?

What is prime factorization?

Prime factorization or prime factor decomposition is the process of finding which prime numbers can be multiplied together to make the original number.

Finding the prime factors of 155,134,440

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there is not a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly. Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

If it doesn't make sense yet, let's try it...

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 155,134,440 by 2

155,134,440 ÷ 2 = 77,567,220 - No remainder! 2 is one of the factors!
77,567,220 ÷ 2 = 38,783,610 - No remainder! 2 is one of the factors!
38,783,610 ÷ 2 = 19,391,805 - No remainder! 2 is one of the factors!
19,391,805 ÷ 2 = 9,695,902.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
19,391,805 ÷ 3 = 6,463,935 - No remainder! 3 is one of the factors!
6,463,935 ÷ 3 = 2,154,645 - No remainder! 3 is one of the factors!
2,154,645 ÷ 3 = 718,215 - No remainder! 3 is one of the factors!
718,215 ÷ 3 = 239,405 - No remainder! 3 is one of the factors!
239,405 ÷ 3 = 79,801.6667 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
239,405 ÷ 5 = 47,881 - No remainder! 5 is one of the factors!
47,881 ÷ 5 = 9,576.2 - There is a remainder. We can't divide by 5 evenly anymore. Let's try the next prime number
47,881 ÷ 7 = 6,840.1429 - This has a remainder. 7 is not a factor.
47,881 ÷ 11 = 4,352.8182 - This has a remainder. 11 is not a factor.
47,881 ÷ 13 = 3,683.1538 - This has a remainder. 13 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
47,881 ÷ 47,881 = 1 - No remainder! 47,881 is one of the factors!

The orange divisor(s) above are the prime factors of the number 155,134,440. If we put all of it together we have the factors 2 x 2 x 2 x 3 x 3 x 3 x 3 x 5 x 47,881 = 155,134,440. It can also be written in exponential form as 23 x 34 x 51 x 47,8811.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 155,134,440.

155,134,440
Factor Arrows
277,567,220
Factor Arrows
238,783,610
Factor Arrows
219,391,805
Factor Arrows
36,463,935
Factor Arrows
32,154,645
Factor Arrows
3718,215
Factor Arrows
3239,405
Factor Arrows
547,881

More Prime Factorization Examples

155,134,438155,134,439155,134,441155,134,442
21 x 5,2091 x 14,89114491 x 345,511173 x 111 x 41,117121 x 77,567,2211

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