166043904 has 72 divisors (see below), whose sum is σ = 475941312. Its totient is φ = 51087360.

The previous prime is 166043897. The next prime is 166043953. The reversal of 166043904 is 409340661.

It is a super-2 number, since 2×166043904² = 55141156111122432, which contains 22 as substring.

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, 1669 + ... + 18299.

It is an arithmetic number, because the mean of its divisors is an integer number (6610296).

Almost surely, 2^166043904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166043904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237970656).

166043904 is an abundant number, since it is smaller than the sum of its proper divisors (309897408).

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

166043904 is a wasteful number, since it uses less digits than its factorization.

166043904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16663 (or 16649 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 166043904 is about 12885.8024197176. The cubic root of 166043904 is about 549.6349136346.

The spelling of 166043904 in words is "one hundred sixty-six million, forty-three thousand, nine hundred four".