6397991390412 has 36 divisors (see below), whose sum is σ = 16191016168600. Its totient is φ = 2130248538432.

The previous prime is 6397991390387. The next prime is 6397991390423. The reversal of 6397991390412 is 2140931997936.

6397991390412 is a `hidden beast` number, since 6 + 39 + 7 + 99 + 13 + 90 + 412 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6397991390412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100603537 + ... + 100667112.

Almost surely, 2^{6397991390412} is an apocalyptic number.

It is an amenable number.

6397991390412 is an abundant number, since it is smaller than the sum of its proper divisors (9793024778188).

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

6397991390412 is a wasteful number, since it uses less digits than its factorization.

6397991390412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201271542 (or 201271537 counting only the distinct ones).

The product of its (nonzero) digits is 19840464, while the sum is 63.

The spelling of 6397991390412 in words is "six trillion, three hundred ninety-seven billion, nine hundred ninety-one million, three hundred ninety thousand, four hundred twelve".