The least common factor of any set of numbers is 1 .
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The Greatest Common Factor of 81, 108, 117: 9
The greatest common factor for the numbers 27 and 81 are 27.
The GCF is 27.
81, as it is the highest factor of 81 (81 and 1) and is also a factor of 162 (81 and 2)
The greatest common factor of 56 and 81 is 1.