315
Any multiple of 315
The lowest common multiple is 315
7 is the number that can go into both 35 and 49.
Seven goes into both 63 and 77
315, 630, 945, 1260 +315 . . .
3 is one such number.
63
Two times 35 is 70. 63 isn't large enough for 35 to go in twice.
40 and 63 have no common prime factors.
1, 5, 7, 35.
The highest number that both 63 and 14 go into is infinity. They go into infinity an infinite number of times (as does every other number). I'm not sure if you have asked the right question, but if you have then the answer is infinity. If, however, you meant, "what is the highest common factor of both 63 & 14?", then the answer is 7. 63 = 9 * 7 and 14 = 2 * 7.
140