166686190812 has 36 divisors (see below), whose sum is σ = 423484477416. Its totient is φ = 55280020320.

The previous prime is 166686190777. The next prime is 166686190829. The reversal of 166686190812 is 218091686661.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11744614 + ... + 11758797.

It is an arithmetic number, because the mean of its divisors is an integer number (11763457706).

Almost surely, 2^166686190812 is an apocalyptic number.

166686190812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166686190812 is an abundant number, since it is smaller than the sum of its proper divisors (256798286604).

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

166686190812 is a wasteful number, since it uses less digits than its factorization.

166686190812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23503618 (or 23503613 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 166686190812 in words is "one hundred sixty-six billion, six hundred eighty-six million, one hundred ninety thousand, eight hundred twelve".