166431980 has 48 divisors (see below), whose sum is σ = 410616864. Its totient is φ = 55864320.

The previous prime is 166431959. The next prime is 166431983. The reversal of 166431980 is 89134661.

It is not an unprimeable number, because it can be changed into a prime (166431983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26237 + ... + 31956.

It is an arithmetic number, because the mean of its divisors is an integer number (8554518).

Almost surely, 2^166431980 is an apocalyptic number.

166431980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166431980 is an abundant number, since it is smaller than the sum of its proper divisors (244184884).

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

166431980 is a wasteful number, since it uses less digits than its factorization.

166431980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58226 (or 58224 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 166431980 is about 12900.8519098546. The cubic root of 166431980 is about 550.0627807123.

The spelling of 166431980 in words is "one hundred sixty-six million, four hundred thirty-one thousand, nine hundred eighty".