The number is 1.
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Each of these numbers goes evenly into 133: 1, 7, 19, 133.
1, 7, 11, 13, 77, 91, 143, 1001.
38 = 2 x 19 (notice that 19 has no smaller factors) 63 = 3 x 3 x 7 Since the two numbers (38 and 63) don't contain any of the same numbers there is no number that goes into both of them.
The number 1.
Seven. 7 x 11 = 77 7 x 9 = 63