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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.
4 and 8, among many others.
9 and 18, among many others.
16 and 32 among many others.
There are many pairs of numbers that have a greatest common factor of 7. Examples: 7, 14 21, 49 35, 63 147, 700 161, 343