666183172 has 12 divisors (see below), whose sum is σ = 1173645900. Its totient is φ = 330855776.

The previous prime is 666183151. The next prime is 666183179. The reversal of 666183172 is 271381666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 155151936 + 511031236 = 12456^2 + 22606^2 .

It is not an unprimeable number, because it can be changed into a prime (666183179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558283 + ... + 559474.

It is an arithmetic number, because the mean of its divisors is an integer number (97803825).

Almost surely, 2^666183172 is an apocalyptic number.

It is an amenable number.

666183172 is a deficient number, since it is larger than the sum of its proper divisors (507462728).

666183172 is a wasteful number, since it uses less digits than its factorization.

666183172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117910 (or 1117908 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 666183172 is about 25810.5244425602. The cubic root of 666183172 is about 873.3692279143.

The spelling of 666183172 in words is "six hundred sixty-six million, one hundred eighty-three thousand, one hundred seventy-two".