Assuming that least common refers to the least common multiple,
LCM(27, 81) = 81
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The common factors of 27 and 81 are: 1, 3, 9, and 27
The LCM of 27 and 63 is 189. The LCM of 81 and 441 is 3969. The LCM of all four is 3969.
The Least Common Multiple of 9 and 81 is 81.
The greatest common factor of 81 and 135 is 27.
The Least Common Multiple of 81 and 165 is 4,455.