Their greatest common factor is 27
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1, 3, 9, 27, 81. 1 x 81 = 81, 3 x 27 = 81, 9 x 9 = 81.
1, 3, 9, 27, 81, -1, -3, -9, -27, -81
It is: 27
27 Since 27 x 3 = 81, and 27 x 1 = 27 then the answer is clear by inspection
81 has 5 factors: 9x9 3 x 27 1 x 81