166404920 has 32 divisors (see below), whose sum is σ = 408449520. Its totient is φ = 60510720.

The previous prime is 166404913. The next prime is 166404923. The reversal of 166404920 is 29404661.

It is a happy number.

166404920 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166404923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188657 + ... + 189536.

Almost surely, 2^166404920 is an apocalyptic number.

166404920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166404920 is an abundant number, since it is smaller than the sum of its proper divisors (242044600).

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

166404920 is a wasteful number, since it uses less digits than its factorization.

166404920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378215 (or 378211 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 166404920 is about 12899.8030992725. The cubic root of 166404920 is about 550.0329677208.

The spelling of 166404920 in words is "one hundred sixty-six million, four hundred four thousand, nine hundred twenty".