165937665 has 16 divisors (see below), whose sum is σ = 265680576. Its totient is φ = 88440000.

The previous prime is 165937661. The next prime is 165937679. The reversal of 165937665 is 566739561.

It is not a de Polignac number, because 165937665 - 2² = 165937661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165937661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27415 + ... + 32915.

It is an arithmetic number, because the mean of its divisors is an integer number (16605036).

Almost surely, 2^165937665 is an apocalyptic number.

165937665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165937665 is a deficient number, since it is larger than the sum of its proper divisors (99742911).

165937665 is a wasteful number, since it uses less digits than its factorization.

165937665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7520.

The product of its digits is 1020600, while the sum is 48.

The square root of 165937665 is about 12881.6794324343. The cubic root of 165937665 is about 549.5176652838.

The spelling of 165937665 in words is "one hundred sixty-five million, nine hundred thirty-seven thousand, six hundred sixty-five".