81079831580 has 48 divisors (see below), whose sum is σ = 188518893696. Its totient is φ = 29043516480.

The previous prime is 81079831531. The next prime is 81079831643. The reversal of 81079831580 is 8513897018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2735594 + ... + 2765073.

It is an arithmetic number, because the mean of its divisors is an integer number (3927476952).

Almost surely, 2^81079831580 is an apocalyptic number.

It is an amenable number.

81079831580 is an abundant number, since it is smaller than the sum of its proper divisors (107439062116).

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

81079831580 is a wasteful number, since it uses less digits than its factorization.

81079831580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500754 (or 5500752 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 81079831580 in words is "eighty-one billion, seventy-nine million, eight hundred thirty-one thousand, five hundred eighty".