166431320 has 32 divisors (see below), whose sum is σ = 408514320. Its totient is φ = 60520320.

The previous prime is 166431311. The next prime is 166431347. The reversal of 166431320 is 23134661.

166431320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 166431320.

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, 188687 + ... + 189566.

Almost surely, 2^166431320 is an apocalyptic number.

166431320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166431320 is an abundant number, since it is smaller than the sum of its proper divisors (242083000).

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

166431320 is a wasteful number, since it uses less digits than its factorization.

166431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378275 (or 378271 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 166431320 is about 12900.8263301232. The cubic root of 166431320 is about 550.0620536046.

Adding to 166431320 its reverse (23134661), we get a palindrome (189565981).

The spelling of 166431320 in words is "one hundred sixty-six million, four hundred thirty-one thousand, three hundred twenty".