81115049922 has 48 divisors (see below), whose sum is σ = 165933917760. Its totient is φ = 26434549152.

The previous prime is 81115049921. The next prime is 81115049941. The reversal of 81115049922 is 22994051118.

It is not an unprimeable number, because it can be changed into a prime (81115049921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14801979 + ... + 14807457.

It is an arithmetic number, because the mean of its divisors is an integer number (3456956620).

Almost surely, 2^81115049922 is an apocalyptic number.

81115049922 is an abundant number, since it is smaller than the sum of its proper divisors (84818867838).

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

81115049922 is a wasteful number, since it uses less digits than its factorization.

81115049922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6695 (or 6648 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The spelling of 81115049922 in words is "eighty-one billion, one hundred fifteen million, forty-nine thousand, nine hundred twenty-two".