81599407090 has 16 divisors (see below), whose sum is σ = 150294722688. Its totient is φ = 31880698416.

The previous prime is 81599407031. The next prime is 81599407117. The reversal of 81599407090 is 9070499518.

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, 94882602 + ... + 94883461.

It is an arithmetic number, because the mean of its divisors is an integer number (9393420168).

Almost surely, 2^81599407090 is an apocalyptic number.

81599407090 is a deficient number, since it is larger than the sum of its proper divisors (68695315598).

81599407090 is a wasteful number, since it uses less digits than its factorization.

81599407090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189766113.

The product of its (nonzero) digits is 816480, while the sum is 52.

The spelling of 81599407090 in words is "eighty-one billion, five hundred ninety-nine million, four hundred seven thousand, ninety".