165864004 has 6 divisors (see below), whose sum is σ = 290262014. Its totient is φ = 82932000.

The previous prime is 165864001. The next prime is 165864011. The reversal of 165864004 is 400468561.

It can be written as a sum of positive squares in only one way, i.e., 141657604 + 24206400 = 11902^2 + 4920^2 .

It is not an unprimeable number, because it can be changed into a prime (165864001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20732997 + ... + 20733004.

Almost surely, 2^165864004 is an apocalyptic number.

It is an amenable number.

165864004 is a deficient number, since it is larger than the sum of its proper divisors (124398010).

165864004 is a wasteful number, since it uses less digits than its factorization.

165864004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41466005 (or 41466003 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 165864004 is about 12878.8199770010. The cubic root of 165864004 is about 549.4363415495.

The spelling of 165864004 in words is "one hundred sixty-five million, eight hundred sixty-four thousand, four".