666560166 has 16 divisors (see below), whose sum is σ = 1403284800. Its totient is φ = 210492648.

The previous prime is 666560161. The next prime is 666560197. The reversal of 666560166 is 661065666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666560161) 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, 2923396 + ... + 2923623.

It is an arithmetic number, because the mean of its divisors is an integer number (87705300).

Almost surely, 2^666560166 is an apocalyptic number.

666560166 is an abundant number, since it is smaller than the sum of its proper divisors (736724634).

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

666560166 is a wasteful number, since it uses less digits than its factorization.

666560166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5847043.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 666560166 is about 25817.8265158011. The cubic root of 666560166 is about 873.5339438080.

The spelling of 666560166 in words is "six hundred sixty-six million, five hundred sixty thousand, one hundred sixty-six".