166877871220 has 24 divisors (see below), whose sum is σ = 350522450208. Its totient is φ = 66736116000.

The previous prime is 166877871217. The next prime is 166877871233. The reversal of 166877871220 is 22178778661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848286 + ... + 1026325.

It is an arithmetic number, because the mean of its divisors is an integer number (14605102092).

Almost surely, 2^166877871220 is an apocalyptic number.

166877871220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166877871220 is an abundant number, since it is smaller than the sum of its proper divisors (183644578988).

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

166877871220 is a wasteful number, since it uses less digits than its factorization.

166877871220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879071 (or 1879069 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 55.

The spelling of 166877871220 in words is "one hundred sixty-six billion, eight hundred seventy-seven million, eight hundred seventy-one thousand, two hundred twenty".