81113724580 has 48 divisors (see below), whose sum is σ = 195798274560. Its totient is φ = 27649657728.

The previous prime is 81113724577. The next prime is 81113724589. The reversal of 81113724580 is 8542731118.

It is not an unprimeable number, because it can be changed into a prime (81113724589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1650300 + ... + 1698739.

It is an arithmetic number, because the mean of its divisors is an integer number (4079130720).

Almost surely, 2^81113724580 is an apocalyptic number.

It is an amenable number.

81113724580 is an abundant number, since it is smaller than the sum of its proper divisors (114684549980).

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

81113724580 is a wasteful number, since it uses less digits than its factorization.

81113724580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349228 (or 3349226 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 81113724580 in words is "eighty-one billion, one hundred thirteen million, seven hundred twenty-four thousand, five hundred eighty".