Seven.
7 x 11 = 77
7 x 9 = 63
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3 goes into both
The highest common factor of 81 and 63 is 9
7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91 . . .
For 21, 63 and 167 the LCM is: 10,521
14, 21, 28, 35, 42, 49, 56, 63, 70, 77 +7 . . .