166665560 has 32 divisors (see below), whose sum is σ = 381358800. Its totient is φ = 65535360.

The previous prime is 166665559. The next prime is 166665563. The reversal of 166665560 is 65566661.

It is a super-2 number, since 2×166665560² = 55554817780227200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166665563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32951 + ... + 37670.

Almost surely, 2^166665560 is an apocalyptic number.

166665560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166665560 is an abundant number, since it is smaller than the sum of its proper divisors (214693240).

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

166665560 is a wasteful number, since it uses less digits than its factorization.

166665560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70691 (or 70687 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 166665560 is about 12909.9016262712. The cubic root of 166665560 is about 550.3199901021.

The spelling of 166665560 in words is "one hundred sixty-six million, six hundred sixty-five thousand, five hundred sixty".