Reciprocals, or multiplicative inverses
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If the product of 2 numbers is one, than those 2 numbers are recipricals
1
1 x 1 = 1 -1 x -1 = 1
There are not two prime numbers whose product is 64. The prime factorization of 64 is 2 x 2 x 2 x 2 x 2 x 2, which is 2 to the 6th power. These are the only prime numbers that can be multiplied together to result in 64. There are six of them, not two. The only pair of numbers whose product is 64 that includes one prime number is 2 x 32, but only one number is prime.