79191911916 has 144 divisors (see below), whose sum is σ = 227383010400. Its totient is φ = 23037613056.

The previous prime is 79191911899. The next prime is 79191911917. The reversal of 79191911916 is 61911919197.

It is not an unprimeable number, because it can be changed into a prime (79191911917) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4517280 + ... + 4534776.

Almost surely, 2^79191911916 is an apocalyptic number.

79191911916 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79191911916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113691505200).

79191911916 is an abundant number, since it is smaller than the sum of its proper divisors (148191098484).

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

79191911916 is a wasteful number, since it uses less digits than its factorization.

79191911916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18048 (or 18043 counting only the distinct ones).

The product of its digits is 275562, while the sum is 54.

The spelling of 79191911916 in words is "seventy-nine billion, one hundred ninety-one million, nine hundred eleven thousand, nine hundred sixteen".