Otherwise known as greatest common factor, it is 63.
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The numbers are co-prime so the only common factor is 1.
The greatest common factor is 9
63, 126, 189, 252, 315, 378, 441, 504, 567, 630, 693, 756, 819, 882, 945, . . . forever
1, 3, 7, 9, 21, 27, 63, 81, 189, 567
The numbers below are the factor pairs of 567 (multiplied together they equal 567) (1, 567) (3, 189) (7, 81) (9, 63) (21, 27)