Only the number 1.
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The factors of 325 are 1, 5, 13, 25, 65, and 325. 5 and 13 are prime.
The common factors of 25 and 50 are 1, 5 and 25.All of them.
The common factors of 75 and 100 are 1, 5 and 25.
Factors of 25: 1, 5, 25Factors of 39: 1, 3, 13, 39GCF (25, 39) = 1
There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.