165556451012166 has 64 divisors (see below), whose sum is σ = 370926310809600. Its totient is φ = 54732316530528.

The previous prime is 165556451012143. The next prime is 165556451012287. The reversal of 165556451012166 is 661210154655561.

165556451012166 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 5 + 6 + 451 + 0 + 121 + 66 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16048716 + ... + 24262608.

It is an arithmetic number, because the mean of its divisors is an integer number (5795723606400).

Almost surely, 2^{165556451012166} is an apocalyptic number.

165556451012166 is an abundant number, since it is smaller than the sum of its proper divisors (205369859797434).

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

165556451012166 is a wasteful number, since it uses less digits than its factorization.

165556451012166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8216970 (or 8216964 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 54.

The spelling of 165556451012166 in words is "one hundred sixty-five trillion, five hundred fifty-six billion, four hundred fifty-one million, twelve thousand, one hundred sixty-six".