81588560208 has 20 divisors (see below), whose sum is σ = 210770447328. Its totient is φ = 27196186720.

The previous prime is 81588560197. The next prime is 81588560233. The reversal of 81588560208 is 80206588518.

It is a congruent number.

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, 849880788 + ... + 849880883.

Almost surely, 2^81588560208 is an apocalyptic number.

It is an amenable number.

81588560208 is an abundant number, since it is smaller than the sum of its proper divisors (129181887120).

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

81588560208 is a wasteful number, since it uses less digits than its factorization.

81588560208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699761682 (or 1699761676 counting only the distinct ones).

The product of its (nonzero) digits is 1228800, while the sum is 51.

The spelling of 81588560208 in words is "eighty-one billion, five hundred eighty-eight million, five hundred sixty thousand, two hundred eight".