81115718848 has 28 divisors (see below), whose sum is σ = 161030256552. Its totient is φ = 40541166080.

The previous prime is 81115718813. The next prime is 81115718851. The reversal of 81115718848 is 84881751118.

It is a junction number, because it is equal to n+sod(n) for n = 81115718795 and 81115718804.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103390 + ... + 415837.

Almost surely, 2^81115718848 is an apocalyptic number.

It is an amenable number.

81115718848 is a deficient number, since it is larger than the sum of its proper divisors (79914537704).

81115718848 is a wasteful number, since it uses less digits than its factorization.

81115718848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521680 (or 521670 counting only the distinct ones).

The product of its digits is 573440, while the sum is 52.

The spelling of 81115718848 in words is "eighty-one billion, one hundred fifteen million, seven hundred eighteen thousand, eight hundred forty-eight".