81259598895 has 16 divisors (see below), whose sum is σ = 130459103712. Its totient is φ = 43190537600.

The previous prime is 81259598803. The next prime is 81259598911. The reversal of 81259598895 is 59889595218.

It is not a de Polignac number, because 81259598895 - 2¹⁴ = 81259582511 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9240156 + ... + 9248945.

It is an arithmetic number, because the mean of its divisors is an integer number (8153693982).

Almost surely, 2^81259598895 is an apocalyptic number.

81259598895 is a deficient number, since it is larger than the sum of its proper divisors (49199504817).

81259598895 is a wasteful number, since it uses less digits than its factorization.

81259598895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18489402.

The product of its digits is 93312000, while the sum is 69.

The spelling of 81259598895 in words is "eighty-one billion, two hundred fifty-nine million, five hundred ninety-eight thousand, eight hundred ninety-five".