166558308172812 has 72 divisors (see below), whose sum is σ = 421608312661536. Its totient is φ = 55442220121344.

The previous prime is 166558308172783. The next prime is 166558308172973. The reversal of 166558308172812 is 218271803855661.

It is a happy number.

166558308172812 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 583 + 0 + 8 + 17 + 28 + 12 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 166558308172812.

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, 81409378 + ... + 83430230.

It is an arithmetic number, because the mean of its divisors is an integer number (5855671009188).

Almost surely, 2^{166558308172812} is an apocalyptic number.

166558308172812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166558308172812 is an abundant number, since it is smaller than the sum of its proper divisors (255050004488724).

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

166558308172812 is a wasteful number, since it uses less digits than its factorization.

166558308172812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024047 (or 2024042 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 63.

The spelling of 166558308172812 in words is "one hundred sixty-six trillion, five hundred fifty-eight billion, three hundred eight million, one hundred seventy-two thousand, eight hundred twelve".