165604 has 12 divisors (see below), whose sum is σ = 305200. Its totient is φ = 78408.

The previous prime is 165601. The next prime is 165611. The reversal of 165604 is 406561.

It is a plaindrome in base 14.

It is a zygodrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (165601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1014 + ... + 1165.

2¹⁶⁵⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

165604 is a deficient number, since it is larger than the sum of its proper divisors (139596).

165604 is a wasteful number, since it uses less digits than its factorization.

165604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 165604 is about 406.9447136897. The cubic root of 165604 is about 54.9149097475.

The spelling of 165604 in words is "one hundred sixty-five thousand, six hundred four".