Q: What are the prime factors of the number 665,325,360?

 A: 2, 3, 5, 7, 79, 557

Why are those the prime factors of the number 665,325,360?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 665,325,360

665,325,360
Factor Arrows
2332,662,680
Factor Arrows
2166,331,340
Factor Arrows
283,165,670
Factor Arrows
241,582,835
Factor Arrows
313,860,945
Factor Arrows
34,620,315
Factor Arrows
31,540,105
Factor Arrows
5308,021
Factor Arrows
744,003
Factor Arrows
79557

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 3, 5, 7, 79, 557

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 3 x 3 x 3 x 5 x 7 x 79 x 557 = 665,325,360

This can also be written as 24 x 33 x 51 x 71 x 791 x 5571 = 665,325,360

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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