81915421260 has 96 divisors (see below), whose sum is σ = 230485651200. Its totient is φ = 21737376000.

The previous prime is 81915421193. The next prime is 81915421261. The reversal of 81915421260 is 6212451918.

It is not an unprimeable number, because it can be changed into a prime (81915421261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25133511 + ... + 25136769.

It is an arithmetic number, because the mean of its divisors is an integer number (2400892200).

Almost surely, 2^81915421260 is an apocalyptic number.

It is an amenable number.

81915421260 is an abundant number, since it is smaller than the sum of its proper divisors (148570229940).

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

81915421260 is a wasteful number, since it uses less digits than its factorization.

81915421260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5191 (or 5189 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 81915421260 in words is "eighty-one billion, nine hundred fifteen million, four hundred twenty-one thousand, two hundred sixty".