165911013 has 12 divisors (see below), whose sum is σ = 240136000. Its totient is φ = 110382696.

The previous prime is 165910999. The next prime is 165911027. The reversal of 165911013 is 310119561.

165911013 is a `hidden beast` number, since 1 + 659 + 1 + 1 + 0 + 1 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (165910999) and next prime (165911027).

It is not a de Polignac number, because 165911013 - 2⁶ = 165910949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165911063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13981 + ... + 22962.

Almost surely, 2^165911013 is an apocalyptic number.

It is an amenable number.

165911013 is a deficient number, since it is larger than the sum of its proper divisors (74224987).

165911013 is a wasteful number, since it uses less digits than its factorization.

165911013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37448 (or 37445 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 165911013 is about 12880.6448984513. The cubic root of 165911013 is about 549.4882435348.

The spelling of 165911013 in words is "one hundred sixty-five million, nine hundred eleven thousand, thirteen".