81559060576 has 72 divisors (see below), whose sum is σ = 194905977840. Its totient is φ = 33434134272.

The previous prime is 81559060511. The next prime is 81559060589. The reversal of 81559060576 is 67506095518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1094691 + ... + 1166818.

It is an arithmetic number, because the mean of its divisors is an integer number (2707027470).

Almost surely, 2^81559060576 is an apocalyptic number.

It is an amenable number.

81559060576 is an abundant number, since it is smaller than the sum of its proper divisors (113346917264).

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

81559060576 is a wasteful number, since it uses less digits than its factorization.

81559060576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261556 (or 2261541 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 52.

The spelling of 81559060576 in words is "eighty-one billion, five hundred fifty-nine million, sixty thousand, five hundred seventy-six".