666688324 has 36 divisors (see below), whose sum is σ = 1198892016. Its totient is φ = 324362544.

The previous prime is 666688291. The next prime is 666688333. The reversal of 666688324 is 423886666.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1921119 + ... + 1921465.

It is an arithmetic number, because the mean of its divisors is an integer number (33302556).

Almost surely, 2^666688324 is an apocalyptic number.

It is an amenable number.

666688324 is a deficient number, since it is larger than the sum of its proper divisors (532203692).

666688324 is a wasteful number, since it uses less digits than its factorization.

666688324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 523 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 49.

The square root of 666688324 is about 25820.3083637667. The cubic root of 666688324 is about 873.5899243455.

The spelling of 666688324 in words is "six hundred sixty-six million, six hundred eighty-eight thousand, three hundred twenty-four".