80791991136 has 96 divisors (see below), whose sum is σ = 242012141280. Its totient is φ = 26202797568.

The previous prime is 80791991113. The next prime is 80791991143. The reversal of 80791991136 is 63119919708.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1231671 + ... + 1295606.

It is an arithmetic number, because the mean of its divisors is an integer number (2520959805).

Almost surely, 2^80791991136 is an apocalyptic number.

It is an amenable number.

80791991136 is an abundant number, since it is smaller than the sum of its proper divisors (161220150144).

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

80791991136 is a wasteful number, since it uses less digits than its factorization.

80791991136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527333 (or 2527319 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 80791991136 in words is "eighty billion, seven hundred ninety-one million, nine hundred ninety-one thousand, one hundred thirty-six".