It depends on the numbers.
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That's the greatest common factor, or GCF.
The greatest common factor is a number that divides evenly into two or more numbers. It is also called the highest common factor or greatest common divisor.
I think you are referring to the Greatest Common Factor of two numbers.
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.
That would be called a "common factor" of the two (or more) numbers.