All multiples of 165, which is an infinite number.
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You should say "What is the common factor of 231 and 165?" or "What number is divisible by both 231 and 165?"In that case, the answer is 11.
A number is divisible by 15 if it is divisible by 5, and by 3. For example, 165 is divisible by 15, since it ends in 5, and the sum of its digits is divisible by 3.
165/6 = 27.5
No.
Yes. 165 is evenly divisible by three.