165391975236 has 12 divisors (see below), whose sum is σ = 385914608912. Its totient is φ = 55130658408.

The previous prime is 165391975187. The next prime is 165391975241. The reversal of 165391975236 is 632579193561.

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, 6891332290 + ... + 6891332313.

Almost surely, 2^165391975236 is an apocalyptic number.

It is an amenable number.

165391975236 is an abundant number, since it is smaller than the sum of its proper divisors (220522633676).

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

165391975236 is a wasteful number, since it uses less digits than its factorization.

165391975236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13782664610 (or 13782664608 counting only the distinct ones).

The product of its digits is 9185400, while the sum is 57.

The spelling of 165391975236 in words is "one hundred sixty-five billion, three hundred ninety-one million, nine hundred seventy-five thousand, two hundred thirty-six".