166636404 has 36 divisors (see below), whose sum is σ = 459513600. Its totient is φ = 50495760.

The previous prime is 166636381. The next prime is 166636411. The reversal of 166636404 is 404636661.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×166636404² = 55535382276102432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210004 + ... + 210795.

Almost surely, 2^166636404 is an apocalyptic number.

It is an amenable number.

166636404 is an abundant number, since it is smaller than the sum of its proper divisors (292877196).

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

166636404 is a wasteful number, since it uses less digits than its factorization.

166636404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420820 (or 420815 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 166636404 is about 12908.7723661083. The cubic root of 166636404 is about 550.2878977583.

The spelling of 166636404 in words is "one hundred sixty-six million, six hundred thirty-six thousand, four hundred four".