81599334108 has 24 divisors (see below), whose sum is σ = 190973677440. Its totient is φ = 27117602160.

The previous prime is 81599334079. The next prime is 81599334149. The reversal of 81599334108 is 80143399518.

It is a congruent number.

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, 10267848 + ... + 10275791.

It is an arithmetic number, because the mean of its divisors is an integer number (7957236560).

Almost surely, 2^81599334108 is an apocalyptic number.

It is an amenable number.

81599334108 is an abundant number, since it is smaller than the sum of its proper divisors (109374343332).

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

81599334108 is a wasteful number, since it uses less digits than its factorization.

81599334108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20543977 (or 20543975 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 81599334108 in words is "eighty-one billion, five hundred ninety-nine million, three hundred thirty-four thousand, one hundred eight".