166665604 has 12 divisors (see below), whose sum is σ = 333331264. Its totient is φ = 71428104.

The previous prime is 166665601. The next prime is 166665683. The reversal of 166665604 is 406566661.

166665604 is an admirable number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (166665601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2976144 + ... + 2976199.

Almost surely, 2^166665604 is an apocalyptic number.

166665604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

166665604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

166665604 is a wasteful number, since it uses less digits than its factorization.

166665604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5952354 (or 5952352 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 166665604 is about 12909.9033303894. The cubic root of 166665604 is about 550.3200385306.

The spelling of 166665604 in words is "one hundred sixty-six million, six hundred sixty-five thousand, six hundred four".