7991918411904 has 192 divisors, whose sum is σ = 26284634787840. Its totient is φ = 2283258544128.

The previous prime is 7991918411891. The next prime is 7991918411999. The reversal of 7991918411904 is 4091148191997.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 218298369 + ... + 218334975.

It is an arithmetic number, because the mean of its divisors is an integer number (136899139520).

Almost surely, 2^{7991918411904} is an apocalyptic number.

It is an amenable number.

7991918411904 is an abundant number, since it is smaller than the sum of its proper divisors (18292716375936).

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

7991918411904 is a wasteful number, since it uses less digits than its factorization.

7991918411904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63707 (or 63692 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 63.

The spelling of 7991918411904 in words is "seven trillion, nine hundred ninety-one billion, nine hundred eighteen million, four hundred eleven thousand, nine hundred four".