Six twos.
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These are the pairs of numbers that when multiplied are equal to 64: (1, 64) (2, 32) (4, 16) (8, 8)
The only prime factor of 64 is 2.
No, they are not relatively prime.
That's a false statement. Both 16 and 64 have one prime factor. 16 can't be the LCM of two prime numbers and 64 can't be the product. If you leave out the word prime, you can use 16 and 4.
The prime numbers are integers greater than 1 that have no positive divisors other than 1 and themselves. The prime numbers less than 64 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, and 61. Therefore, the prime numbers of 64 are 2 and 61.