165180318156 has 72 divisors (see below), whose sum is σ = 477385170080. Its totient is φ = 47174835456.

The previous prime is 165180318139. The next prime is 165180318187. The reversal of 165180318156 is 651813081561.

It is a happy number.

165180318156 is a `hidden beast` number, since 1 + 6 + 5 + 180 + 318 + 156 = 666.

It is a super-2 number, since 2×165180318156² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 479640 + ... + 748608.

Almost surely, 2^165180318156 is an apocalyptic number.

It is an amenable number.

165180318156 is an abundant number, since it is smaller than the sum of its proper divisors (312204851924).

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

165180318156 is a wasteful number, since it uses less digits than its factorization.

165180318156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271423 (or 271418 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 165180318156 in words is "one hundred sixty-five billion, one hundred eighty million, three hundred eighteen thousand, one hundred fifty-six".