166077901980 has 72 divisors (see below), whose sum is σ = 510865022304. Its totient is φ = 43663670400.

The previous prime is 166077901973. The next prime is 166077902021. The reversal of 166077901980 is 89109770661.

166077901980 is a `hidden beast` number, since 16 + 607 + 7 + 9 + 0 + 19 + 8 + 0 = 666.

It is a congruent number.

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, 6484791 + ... + 6510350.

It is an arithmetic number, because the mean of its divisors is an integer number (7095347532).

Almost surely, 2^166077901980 is an apocalyptic number.

166077901980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166077901980 is an abundant number, since it is smaller than the sum of its proper divisors (344787120324).

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

166077901980 is a wasteful number, since it uses less digits than its factorization.

166077901980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12995227 (or 12995222 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The spelling of 166077901980 in words is "one hundred sixty-six billion, seventy-seven million, nine hundred one thousand, nine hundred eighty".