81589651023 has 8 divisors (see below), whose sum is σ = 108795282688. Its totient is φ = 54388560024.

The previous prime is 81589650997. The next prime is 81589651051. The reversal of 81589651023 is 32015698518.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81589651023 - 2⁵ = 81589650991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81589651823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093015 + ... + 1165272.

It is an arithmetic number, because the mean of its divisors is an integer number (13599410336).

Almost surely, 2^81589651023 is an apocalyptic number.

81589651023 is a deficient number, since it is larger than the sum of its proper divisors (27205631665).

81589651023 is a wasteful number, since it uses less digits than its factorization.

81589651023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270333.

The product of its (nonzero) digits is 518400, while the sum is 48.

The spelling of 81589651023 in words is "eighty-one billion, five hundred eighty-nine million, six hundred fifty-one thousand, twenty-three".