81590015084736 has 56 divisors (see below), whose sum is σ = 215894290201920. Its totient is φ = 27194062734592.

The previous prime is 81590015084723. The next prime is 81590015084749. The reversal of 81590015084736 is 63748051009518.

It is an interprime number because it is at equal distance from previous prime (81590015084723) and next prime (81590015084749).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18375306 + ... + 22379273.

Almost surely, 2^{81590015084736} is an apocalyptic number.

It is an amenable number.

81590015084736 is an abundant number, since it is smaller than the sum of its proper divisors (134304275117184).

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

81590015084736 is a wasteful number, since it uses less digits than its factorization.

81590015084736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40765021 (or 40765011 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 57.

The spelling of 81590015084736 in words is "eighty-one trillion, five hundred ninety billion, fifteen million, eighty-four thousand, seven hundred thirty-six".