The lowest common factor of any set of positive integers is 1.
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The GCF of 138 and 345 is 69
It is: 2
The greatest common factor is three.
The GCF is 138.
It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!