6644036968 has 16 divisors (see below), whose sum is σ = 13190367780. Its totient is φ = 3126605568.

The previous prime is 6644036947. The next prime is 6644037007. The reversal of 6644036968 is 8696304466.

It can be written as a sum of positive squares in 2 ways, for example, as 6470271844 + 173765124 = 80438^2 + 13182^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24426471 + ... + 24426742.

Almost surely, 2^6644036968 is an apocalyptic number.

6644036968 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6644036968 is a deficient number, since it is larger than the sum of its proper divisors (6546330812).

6644036968 is a wasteful number, since it uses less digits than its factorization.

6644036968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48853236 (or 48853232 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 52.

The square root of 6644036968 is about 81510.9622566192. The cubic root of 6644036968 is about 1879.9401074929.

The spelling of 6644036968 in words is "six billion, six hundred forty-four million, thirty-six thousand, nine hundred sixty-eight".