6399831434544 has 50 divisors (see below), whose sum is σ = 18522968916540. Its totient is φ = 2133277144416.

The previous prime is 6399831434509. The next prime is 6399831434551. The reversal of 6399831434544 is 4454341389936.

It is a happy number.

6399831434544 is a `hidden beast` number, since 6 + 3 + 9 + 9 + 83 + 1 + 4 + 3 + 4 + 544 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2469069474 + ... + 2469072065.

Almost surely, 2^{6399831434544} is an apocalyptic number.

It is an amenable number.

6399831434544 is an abundant number, since it is smaller than the sum of its proper divisors (12123137481996).

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

6399831434544 is a wasteful number, since it uses less digits than its factorization.

6399831434544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938141559 (or 4938141544 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 63.

The spelling of 6399831434544 in words is "six trillion, three hundred ninety-nine billion, eight hundred thirty-one million, four hundred thirty-four thousand, five hundred forty-four".