664686268 has 12 divisors (see below), whose sum is σ = 1169047600. Its totient is φ = 330672672.

The previous prime is 664686263. The next prime is 664686289. The reversal of 664686268 is 862686466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664686263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416721 + ... + 418312.

Almost surely, 2^664686268 is an apocalyptic number.

It is an amenable number.

664686268 is a deficient number, since it is larger than the sum of its proper divisors (504361332).

664686268 is a wasteful number, since it uses less digits than its factorization.

664686268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835236 (or 835234 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 52.

The square root of 664686268 is about 25781.5101962627. The cubic root of 664686268 is about 872.7145879851.

The spelling of 664686268 in words is "six hundred sixty-four million, six hundred eighty-six thousand, two hundred sixty-eight".