81160976388 has 24 divisors (see below), whose sum is σ = 189380318400. Its totient is φ = 27052986400.

The previous prime is 81160976363. The next prime is 81160976389. The reversal of 81160976388 is 88367906118.

It is not an unprimeable number, because it can be changed into a prime (81160976389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749713 + ... + 851111.

It is an arithmetic number, because the mean of its divisors is an integer number (7890846600).

Almost surely, 2^81160976388 is an apocalyptic number.

It is an amenable number.

81160976388 is an abundant number, since it is smaller than the sum of its proper divisors (108219342012).

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

81160976388 is a wasteful number, since it uses less digits than its factorization.

81160976388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168107 (or 168105 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 57.

The spelling of 81160976388 in words is "eighty-one billion, one hundred sixty million, nine hundred seventy-six thousand, three hundred eighty-eight".