There can be no greatest common denominator. If you have a set a numbers whose least common denominator is L then 2*L, 3*L, … are all common denominators. There is no end to that sequence and so no greatest.
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Since 54 is a multiple of 18, it will also be the least common denominator of the two.
The greatest common factor of 36, 81 and 18 is 9
The GCF is 9.63/81 = 7/9
Assuming that least common refers to the least common multiple, LCM(27, 81) = 81
No, 18 is not a factor of 81.
You need at least two numbers to find something in common between them.