6399218618943 has 4 divisors (see below), whose sum is σ = 8532291491928. Its totient is φ = 4266145745960.

The previous prime is 6399218618909. The next prime is 6399218618951. The reversal of 6399218618943 is 3498168129936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6399218618943 - 2⁸ = 6399218618687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399218618743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066536436488 + ... + 1066536436493.

It is an arithmetic number, because the mean of its divisors is an integer number (2133072872982).

Almost surely, 2^{6399218618943} is an apocalyptic number.

6399218618943 is a deficient number, since it is larger than the sum of its proper divisors (2133072872985).

6399218618943 is a wasteful number, since it uses less digits than its factorization.

6399218618943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133072872984.

The product of its digits is 120932352, while the sum is 69.

The spelling of 6399218618943 in words is "six trillion, three hundred ninety-nine billion, two hundred eighteen million, six hundred eighteen thousand, nine hundred forty-three".