81594260321 has 16 divisors (see below), whose sum is σ = 93516604800. Its totient is φ = 69738565248.

The previous prime is 81594260309. The next prime is 81594260329. The reversal of 81594260321 is 12306249518.

It is a cyclic number.

It is not a de Polignac number, because 81594260321 - 2⁶ = 81594260257 is a prime.

It is a super-2 number, since 2×81594260321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81594260329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10128131 + ... + 10136183.

It is an arithmetic number, because the mean of its divisors is an integer number (5844787800).

Almost surely, 2^81594260321 is an apocalyptic number.

It is an amenable number.

81594260321 is a deficient number, since it is larger than the sum of its proper divisors (11922344479).

81594260321 is a wasteful number, since it uses less digits than its factorization.

81594260321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12008.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 81594260321 in words is "eighty-one billion, five hundred ninety-four million, two hundred sixty thousand, three hundred twenty-one".