81594254580 has 24 divisors (see below), whose sum is σ = 228463912992. Its totient is φ = 21758467872.

The previous prime is 81594254549. The next prime is 81594254597. The reversal of 81594254580 is 8545249518.

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, 679952062 + ... + 679952181.

It is an arithmetic number, because the mean of its divisors is an integer number (9519329708).

Almost surely, 2^81594254580 is an apocalyptic number.

It is an amenable number.

81594254580 is an abundant number, since it is smaller than the sum of its proper divisors (146869658412).

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

81594254580 is a wasteful number, since it uses less digits than its factorization.

81594254580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359904255 (or 1359904253 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 51.

The spelling of 81594254580 in words is "eighty-one billion, five hundred ninety-four million, two hundred fifty-four thousand, five hundred eighty".