Yes. it is. Because 1+6+5 = 12 and 3 goes into 12.
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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.
All multiples of 165, which is an infinite number.