81588577488 has 160 divisors (see below), whose sum is σ = 241822236672. Its totient is φ = 23462208000.

The previous prime is 81588577459. The next prime is 81588577517. The reversal of 81588577488 is 88477588518.

It is an interprime number because it is at equal distance from previous prime (81588577459) and next prime (81588577517).

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1515838 + ... + 1568738.

Almost surely, 2^81588577488 is an apocalyptic number.

81588577488 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81588577488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120911118336).

81588577488 is an abundant number, since it is smaller than the sum of its proper divisors (160233659184).

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

81588577488 is a wasteful number, since it uses less digits than its factorization.

81588577488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53073 (or 53067 counting only the distinct ones).

The product of its digits is 160563200, while the sum is 69.

The spelling of 81588577488 in words is "eighty-one billion, five hundred eighty-eight million, five hundred seventy-seven thousand, four hundred eighty-eight".