166664988 has 72 divisors (see below), whose sum is σ = 483243488. Its totient is φ = 47443968.

The previous prime is 166664963. The next prime is 166665011. The reversal of 166664988 is 889466661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77820 + ... + 79932.

Almost surely, 2^166664988 is an apocalyptic number.

166664988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166664988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241621744).

166664988 is an abundant number, since it is smaller than the sum of its proper divisors (316578500).

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

166664988 is a wasteful number, since it uses less digits than its factorization.

166664988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443 (or 2438 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 166664988 is about 12909.8794727139. The cubic root of 166664988 is about 550.3193605312.

The spelling of 166664988 in words is "one hundred sixty-six million, six hundred sixty-four thousand, nine hundred eighty-eight".