666187232 has 12 divisors (see below), whose sum is σ = 1311556176. Its totient is φ = 333093600.

The previous prime is 666187219. The next prime is 666187271. The reversal of 666187232 is 232781666.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 666187232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10409144 + ... + 10409207.

It is an arithmetic number, because the mean of its divisors is an integer number (109296348).

Almost surely, 2^666187232 is an apocalyptic number.

It is an amenable number.

666187232 is a deficient number, since it is larger than the sum of its proper divisors (645368944).

666187232 is a wasteful number, since it uses less digits than its factorization.

666187232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20818361 (or 20818353 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 666187232 is about 25810.6030925277. The cubic root of 666187232 is about 873.3710021370.

The spelling of 666187232 in words is "six hundred sixty-six million, one hundred eighty-seven thousand, two hundred thirty-two".