6645917939584 has 128 divisors (see below), whose sum is σ = 17039388211200. Its totient is φ = 2505792153600.

The previous prime is 6645917939543. The next prime is 6645917939587. The reversal of 6645917939584 is 4859397195466.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 6645917939584.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645917939587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10570299 + ... + 11181370.

It is an arithmetic number, because the mean of its divisors is an integer number (133120220400).

Almost surely, 2^{6645917939584} is an apocalyptic number.

6645917939584 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6645917939584 is an abundant number, since it is smaller than the sum of its proper divisors (10393470271616).

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

6645917939584 is a wasteful number, since it uses less digits than its factorization.

6645917939584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21751732 (or 21751720 counting only the distinct ones).

The product of its digits is 1763596800, while the sum is 76.

The spelling of 6645917939584 in words is "six trillion, six hundred forty-five billion, nine hundred seventeen million, nine hundred thirty-nine thousand, five hundred eighty-four".