165604972 has 24 divisors (see below), whose sum is σ = 316766576. Its totient is φ = 75290688.

The previous prime is 165604937. The next prime is 165605009. The reversal of 165604972 is 279406561.

It is a super-2 number, since 2×165604972² = 54850013502241568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20283 + ... + 27250.

Almost surely, 2^165604972 is an apocalyptic number.

It is an amenable number.

165604972 is a deficient number, since it is larger than the sum of its proper divisors (151161604).

165604972 is a wasteful number, since it uses less digits than its factorization.

165604972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47617 (or 47615 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 165604972 is about 12868.7595361791. The cubic root of 165604972 is about 549.1501718686.

The spelling of 165604972 in words is "one hundred sixty-five million, six hundred four thousand, nine hundred seventy-two".