166187658990 has 32 divisors (see below), whose sum is σ = 398905168896. Its totient is φ = 44310621600.

The previous prime is 166187658983. The next prime is 166187659003. The reversal of 166187658990 is 99856781661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156262 + ... + 597321.

It is an arithmetic number, because the mean of its divisors is an integer number (12465786528).

Almost surely, 2^166187658990 is an apocalyptic number.

166187658990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166187658990 is an abundant number, since it is smaller than the sum of its proper divisors (232717509906).

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

166187658990 is a wasteful number, since it uses less digits than its factorization.

166187658990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760944.

The product of its (nonzero) digits is 39191040, while the sum is 66.

The spelling of 166187658990 in words is "one hundred sixty-six billion, one hundred eighty-seven million, six hundred fifty-eight thousand, nine hundred ninety".