I think you're mixing a few concepts here. In order to find something in common with something else, you need at least two things. You have only one expression here. The least common factor of any set of integers is 1. I suspect you may want to factor this expression. There is a formula for the difference of squares. This factors to (x - 8)(x + 8) You could compare those factors to the factors of another expression to find something in common between them.
the least common factor and only common factor of 9, 36, and 64 is 1.
The least common factor is: 1
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of numbers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of numbers is 1.
The least common factor of any set of positive integers is 1.
The least common factor of any two or more positive integers is always 1
The factors of 16 are 1, 2, 4, 8, and 16. The factors of 64 are 1, 2, 4, 8, 16, 32, and 64. The common factors are 1, 2, 4, 8, and 16. The least (smallest) common factor is 1. The smallest common prime factor is 2.