81589551762 has 16 divisors (see below), whose sum is σ = 163736032320. Its totient is φ = 27103695792.

The previous prime is 81589551737. The next prime is 81589551763. The reversal of 81589551762 is 26715598518.

It is not an unprimeable number, because it can be changed into a prime (81589551763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23203462 + ... + 23206977.

It is an arithmetic number, because the mean of its divisors is an integer number (10233502020).

Almost surely, 2^81589551762 is an apocalyptic number.

81589551762 is an abundant number, since it is smaller than the sum of its proper divisors (82146480558).

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

81589551762 is a wasteful number, since it uses less digits than its factorization.

81589551762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46410737.

The product of its digits is 6048000, while the sum is 57.

The spelling of 81589551762 in words is "eighty-one billion, five hundred eighty-nine million, five hundred fifty-one thousand, seven hundred sixty-two".