81058866588 has 240 divisors, whose sum is σ = 250482591744. Its totient is φ = 22368286080.

The previous prime is 81058866587. The next prime is 81058866601. The reversal of 81058866588 is 88566885018.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81058866587) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 53222395 + ... + 53223917.

Almost surely, 2^81058866588 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81058866588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125241295872).

81058866588 is an abundant number, since it is smaller than the sum of its proper divisors (169423725156).

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

81058866588 is a wasteful number, since it uses less digits than its factorization.

81058866588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334 (or 2323 counting only the distinct ones).

The product of its (nonzero) digits is 29491200, while the sum is 63.

The spelling of 81058866588 in words is "eighty-one billion, fifty-eight million, eight hundred sixty-six thousand, five hundred eighty-eight".