81697597423 has 8 divisors (see below), whose sum is σ = 88033115408. Its totient is φ = 75369377664.

The previous prime is 81697597417. The next prime is 81697597447. The reversal of 81697597423 is 32479579618.

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

It is a cyclic number.

It is not a de Polignac number, because 81697597423 - 2²⁵ = 81664042991 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 (81697597123) 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, 1801290 + ... + 1846087.

It is an arithmetic number, because the mean of its divisors is an integer number (11004139426).

Almost surely, 2^81697597423 is an apocalyptic number.

81697597423 is a deficient number, since it is larger than the sum of its proper divisors (6335517985).

81697597423 is a wasteful number, since it uses less digits than its factorization.

81697597423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3649113.

The product of its digits is 22861440, while the sum is 61.

The spelling of 81697597423 in words is "eighty-one billion, six hundred ninety-seven million, five hundred ninety-seven thousand, four hundred twenty-three".