165213612 has 36 divisors (see below), whose sum is σ = 420297696. Its totient is φ = 54718560.

The previous prime is 165213563. The next prime is 165213647. The reversal of 165213612 is 216312561.

165213612 is a `hidden beast` number, since 1 + 652 + 1 + 3 + 6 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8964 + ... + 20267.

It is an arithmetic number, because the mean of its divisors is an integer number (11674936).

Almost surely, 2^165213612 is an apocalyptic number.

165213612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165213612 is an abundant number, since it is smaller than the sum of its proper divisors (255084084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165213612 is a wasteful number, since it uses less digits than its factorization.

165213612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29398 (or 29393 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 165213612 is about 12853.5447250943. The cubic root of 165213612 is about 548.7172441847.

The spelling of 165213612 in words is "one hundred sixty-five million, two hundred thirteen thousand, six hundred twelve".