165867009612 has 12 divisors (see below), whose sum is σ = 387023022456. Its totient is φ = 55289003200.

The previous prime is 165867009577. The next prime is 165867009667. The reversal of 165867009612 is 216900768561.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6911125389 + ... + 6911125412.

It is an arithmetic number, because the mean of its divisors is an integer number (32251918538).

Almost surely, 2^165867009612 is an apocalyptic number.

165867009612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165867009612 is an abundant number, since it is smaller than the sum of its proper divisors (221156012844).

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

165867009612 is a wasteful number, since it uses less digits than its factorization.

165867009612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13822250808 (or 13822250806 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 165867009612 in words is "one hundred sixty-five billion, eight hundred sixty-seven million, nine thousand, six hundred twelve".