81439596498 has 32 divisors (see below), whose sum is σ = 181066701312. Its totient is φ = 24250003200.

The previous prime is 81439596473. The next prime is 81439596559. The reversal of 81439596498 is 89469593418.

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, 16837863 + ... + 16842698.

It is an arithmetic number, because the mean of its divisors is an integer number (5658334416).

Almost surely, 2^81439596498 is an apocalyptic number.

81439596498 is an abundant number, since it is smaller than the sum of its proper divisors (99627104814).

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

81439596498 is a wasteful number, since it uses less digits than its factorization.

81439596498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33680610.

The product of its digits is 67184640, while the sum is 66.

The spelling of 81439596498 in words is "eighty-one billion, four hundred thirty-nine million, five hundred ninety-six thousand, four hundred ninety-eight".