165820972 has 6 divisors (see below), whose sum is σ = 290186708. Its totient is φ = 82910484.

The previous prime is 165820957. The next prime is 165821017. The reversal of 165820972 is 279028561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20727618 + ... + 20727625.

Almost surely, 2^165820972 is an apocalyptic number.

It is an amenable number.

165820972 is a deficient number, since it is larger than the sum of its proper divisors (124365736).

165820972 is a wasteful number, since it uses less digits than its factorization.

165820972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41455247 (or 41455245 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 165820972 is about 12877.1492186741. The cubic root of 165820972 is about 549.3888219168.

The spelling of 165820972 in words is "one hundred sixty-five million, eight hundred twenty thousand, nine hundred seventy-two".