What is the greatest common factor of 16?

The greatest common factor of 16 is 16. This is because 16 is a multiple of itself, and there is no other factor of 16 that is greater than 16. The greatest common factor, or GCF, of any number is the largest factor that is common to all of the numbers in a set. Therefore, if a set of numbers contains 16, the GCF of that set will always be 16 or a number that is a common factor of 16. For example, the GCF of 16 and 24 is 8, because 8 is the largest factor that both 16 and 24 share.