166164990 has 32 divisors (see below), whose sum is σ = 399198240. Its totient is φ = 44265984.

The previous prime is 166164967. The next prime is 166165007. The reversal of 166164990 is 99461661.

It is a super-2 number, since 2×166164990² = 55221607803400200, which contains 22 as substring.

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, 36522 + ... + 40818.

It is an arithmetic number, because the mean of its divisors is an integer number (12474945).

Almost surely, 2^166164990 is an apocalyptic number.

166164990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 12890×12891.

166164990 is an abundant number, since it is smaller than the sum of its proper divisors (233033250).

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

166164990 is a wasteful number, since it uses less digits than its factorization.

166164990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5596.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 166164990 is about 12890.4999903029. The cubic root of 166164990 is about 549.7684865840.

The spelling of 166164990 in words is "one hundred sixty-six million, one hundred sixty-four thousand, nine hundred ninety".