6640336968 has 64 divisors (see below), whose sum is σ = 16807901760. Its totient is φ = 2185967616.

The previous prime is 6640336943. The next prime is 6640337027. The reversal of 6640336968 is 8696330466.

It is a self number, because there is not a number n which added to its sum of digits gives 6640336968.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 861580 + ... + 869252.

It is an arithmetic number, because the mean of its divisors is an integer number (262623465).

Almost surely, 2^6640336968 is an apocalyptic number.

It is an amenable number.

6640336968 is an abundant number, since it is smaller than the sum of its proper divisors (10167564792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6640336968 is a wasteful number, since it uses less digits than its factorization.

6640336968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8126 (or 8122 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 51.

The square root of 6640336968 is about 81488.2627621917. The cubic root of 6640336968 is about 1879.5910691982.

The spelling of 6640336968 in words is "six billion, six hundred forty million, three hundred thirty-six thousand, nine hundred sixty-eight".