Since 81 is not divisible by 7 therefore, 7 is not a factor of 81.
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No, 18 is not a factor of 81.
Nine is the highest common factor of 81 and 9
1, 3, 7, 9, 21, 27, 63, 81, 189, 567
The GCF of 53 and 81 is 1.
The greatest common factor of 56 and 81 is 1.