7991111996 has 48 divisors (see below), whose sum is σ = 16950581760. Its totient is φ = 3222141120.

The previous prime is 7991111993. The next prime is 7991112007. The reversal of 7991111996 is 6991111997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991111993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62426 + ... + 140993.

It is an arithmetic number, because the mean of its divisors is an integer number (353137120).

Almost surely, 2^7991111996 is an apocalyptic number.

It is an amenable number.

7991111996 is an abundant number, since it is smaller than the sum of its proper divisors (8959469764).

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

7991111996 is a wasteful number, since it uses less digits than its factorization.

7991111996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203514 (or 203512 counting only the distinct ones).

The product of its digits is 275562, while the sum is 53.

The square root of 7991111996 is about 89393.0198393588. The cubic root of 7991111996 is about 1999.2590585368.

Subtracting from 7991111996 its reverse (6991111997), we obtain a palindrome (999999999).

The spelling of 7991111996 in words is "seven billion, nine hundred ninety-one million, one hundred eleven thousand, nine hundred ninety-six".