166399790 has 16 divisors (see below), whose sum is σ = 300689712. Its totient is φ = 66299904.

The previous prime is 166399781. The next prime is 166399817. The reversal of 166399790 is 97993661.

It is a super-2 number, since 2×166399790² = 55377780224088200, 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 7 ways as a sum of consecutive naturals, for example, 29804 + ... + 34943.

It is an arithmetic number, because the mean of its divisors is an integer number (18793107).

Almost surely, 2^166399790 is an apocalyptic number.

166399790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166399790 is a deficient number, since it is larger than the sum of its proper divisors (134289922).

166399790 is a wasteful number, since it uses less digits than its factorization.

166399790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65011.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 166399790 is about 12899.6042574957. The cubic root of 166399790 is about 550.0273154478.

The spelling of 166399790 in words is "one hundred sixty-six million, three hundred ninety-nine thousand, seven hundred ninety".