it is a Prime number because no number can go in to 37 but it self.
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777 = 3 x 7 x 37
The factors of 111 are: 1, 3, 37 and 111.The factors of 37 are: 1, and 37.The common factors of 111 and 37 are: 1, and 37.The greatest common common factor of 111 and 37 is: 37.
factor tree of 216
The gcf of 37 and 81 is 1 (their only common factor)
666 333,2 111,3,2 37,3,3,2 2 x 3 x 3 x 37 = 666