166665880 has 16 divisors (see below), whose sum is σ = 374998320. Its totient is φ = 66666336.

The previous prime is 166665869. The next prime is 166665881. The reversal of 166665880 is 88566661.

It is a self number, because there is not a number n which added to its sum of digits gives 166665880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166665881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083284 + ... + 2083363.

It is an arithmetic number, because the mean of its divisors is an integer number (23437395).

Almost surely, 2^166665880 is an apocalyptic number.

166665880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166665880 is an abundant number, since it is smaller than the sum of its proper divisors (208332440).

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

166665880 is a wasteful number, since it uses less digits than its factorization.

166665880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4166658 (or 4166654 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 166665880 is about 12909.9140198531. The cubic root of 166665880 is about 550.3203423090.

The spelling of 166665880 in words is "one hundred sixty-six million, six hundred sixty-five thousand, eight hundred eighty".