You would round it up to 18 !
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Since the sum if its digits (1 + 7 + 7 = 15) is divisible by 3, the original number 177 is divisible by 3.Now we know that it has at least one factor in addition to '1' and itself, so it's not prime.
1, 3, 59, 177
3 x 59 = 177
59 times.