666111166 has 32 divisors (see below), whose sum is σ = 1177224192. Its totient is φ = 276761760.

The previous prime is 666111113. The next prime is 666111169. The reversal of 666111166 is 661111666.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666111169) 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, 65676 + ... + 75136.

It is an arithmetic number, because the mean of its divisors is an integer number (36788256).

Almost surely, 2^666111166 is an apocalyptic number.

666111166 is a deficient number, since it is larger than the sum of its proper divisors (511113026).

666111166 is a wasteful number, since it uses less digits than its factorization.

666111166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9624.

The product of its digits is 7776, while the sum is 34.

The square root of 666111166 is about 25809.1295087610. The cubic root of 666111166 is about 873.3377600472.

The spelling of 666111166 in words is "six hundred sixty-six million, one hundred eleven thousand, one hundred sixty-six".