6399918456156 has 72 divisors (see below), whose sum is σ = 16326000198144. Its totient is φ = 2113812249120.

The previous prime is 6399918456149. The next prime is 6399918456179. The reversal of 6399918456156 is 6516548199936.

6399918456156 is a `hidden beast` number, since 6 + 3 + 9 + 9 + 9 + 1 + 8 + 4 + 561 + 56 = 666.

It is a super-3 number, since 3×6399918456156³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 294805 + ... + 3589811.

It is an arithmetic number, because the mean of its divisors is an integer number (226750002752).

Almost surely, 2^{6399918456156} is an apocalyptic number.

It is an amenable number.

6399918456156 is an abundant number, since it is smaller than the sum of its proper divisors (9926081741988).

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

6399918456156 is a wasteful number, since it uses less digits than its factorization.

6399918456156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295511 (or 3295506 counting only the distinct ones).

The product of its digits is 377913600, while the sum is 72.

The spelling of 6399918456156 in words is "six trillion, three hundred ninety-nine billion, nine hundred eighteen million, four hundred fifty-six thousand, one hundred fifty-six".