6399218618944 has 28 divisors (see below), whose sum is σ = 12700000780288. Its totient is φ = 3199218422400.

The previous prime is 6399218618909. The next prime is 6399218618951. The reversal of 6399218618944 is 4498168129936.

It is a happy number.

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, 5579292 + ... + 6627739.

Almost surely, 2^{6399218618944} is an apocalyptic number.

6399218618944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6399218618944 is a deficient number, since it is larger than the sum of its proper divisors (6300782161344).

6399218618944 is a wasteful number, since it uses less digits than its factorization.

6399218618944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12215234 (or 12215224 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 70.

The spelling of 6399218618944 in words is "six trillion, three hundred ninety-nine billion, two hundred eighteen million, six hundred eighteen thousand, nine hundred forty-four".