Q: What are the prime factors of the number 65,657,216?

 A: 2, 43, 79, 151

Why are those the prime factors of the number 65,657,216?

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 65,657,216

65,657,216
Factor Arrows
232,828,608
Factor Arrows
216,414,304
Factor Arrows
28,207,152
Factor Arrows
24,103,576
Factor Arrows
22,051,788
Factor Arrows
21,025,894
Factor Arrows
2512,947
Factor Arrows
4311,929
Factor Arrows
79151

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, 43, 79, 151

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 43 x 79 x 151 = 65,657,216

This can also be written as 27 x 431 x 791 x 1511 = 65,657,216

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


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