Two (or more) integers have a common factor - e.g., the greatest common factor of 173 and 100 is 1, or the greatest common factor of 173 and 519 is 173. The question makes no sense with one number. 173 is a prime, by the way.
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Greatest common factor for 102 and 357 is 51.
The greatest common factor is 2
The Greatest Common Factor (GCF) is: 8
Just 1.
The greatest common factor (GCF) is: 5.