668585866 has 16 divisors (see below), whose sum is σ = 1114864128. Its totient is φ = 298623600.

The previous prime is 668585849. The next prime is 668585867.

It is a happy number.

668585866 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 668585866.

It is not an unprimeable number, because it can be changed into a prime (668585867) 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, 413950 + ... + 415561.

It is an arithmetic number, because the mean of its divisors is an integer number (69679008).

Almost surely, 2^668585866 is an apocalyptic number.

668585866 is a deficient number, since it is larger than the sum of its proper divisors (446278262).

668585866 is a wasteful number, since it uses less digits than its factorization.

668585866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829557.

The product of its digits is 16588800, while the sum is 58.

The square root of 668585866 is about 25857.0274006894. The cubic root of 668585866 is about 874.4179491227.

The spelling of 668585866 in words is "six hundred sixty-eight million, five hundred eighty-five thousand, eight hundred sixty-six".