6640447317 has 24 divisors (see below), whose sum is σ = 10444548672. Its totient is φ = 3741091200.

The previous prime is 6640447283. The next prime is 6640447321. The reversal of 6640447317 is 7137440466.

It is not a de Polignac number, because 6640447317 - 2¹² = 6640443221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640442317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307684 + ... + 328557.

It is an arithmetic number, because the mean of its divisors is an integer number (435189528).

Almost surely, 2^6640447317 is an apocalyptic number.

It is an amenable number.

6640447317 is a deficient number, since it is larger than the sum of its proper divisors (3804101355).

6640447317 is a wasteful number, since it uses less digits than its factorization.

6640447317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636329 (or 636322 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 42.

The square root of 6640447317 is about 81488.9398446194. The cubic root of 6640447317 is about 1879.6014808107.

The spelling of 6640447317 in words is "six billion, six hundred forty million, four hundred forty-seven thousand, three hundred seventeen".