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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.
A common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! Consequently, the question makes no sense.
The Greatest Common Factor, or GCF.
That's the greatest common factor, or GCF.
There is no Greatest Common Factor (GCF) for a single number. The Greatest Common Factor (GCF) is the largest factor common to two or more given numbers.