6664731868 has 6 divisors (see below), whose sum is σ = 11663280776. Its totient is φ = 3332365932.

The previous prime is 6664731851. The next prime is 6664731883. The reversal of 6664731868 is 8681374666.

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, 833091480 + ... + 833091487.

Almost surely, 2^6664731868 is an apocalyptic number.

It is an amenable number.

6664731868 is a deficient number, since it is larger than the sum of its proper divisors (4998548908).

6664731868 is a wasteful number, since it uses less digits than its factorization.

6664731868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666182971 (or 1666182969 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 55.

The square root of 6664731868 is about 81637.8090592833. The cubic root of 6664731868 is about 1881.8899686202.

The spelling of 6664731868 in words is "six billion, six hundred sixty-four million, seven hundred thirty-one thousand, eight hundred sixty-eight".