81369877612798 has 32 divisors (see below), whose sum is σ = 124593561455616. Its totient is φ = 39849882812928.

The previous prime is 81369877612787. The next prime is 81369877612883. The reversal of 81369877612798 is 89721677896318.

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, 688915 + ... + 12775537.

It is an arithmetic number, because the mean of its divisors is an integer number (3893548795488).

Almost surely, 2^{81369877612798} is an apocalyptic number.

81369877612798 is a deficient number, since it is larger than the sum of its proper divisors (43223683842818).

81369877612798 is a wasteful number, since it uses less digits than its factorization.

81369877612798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12087088.

The product of its digits is 3072577536, while the sum is 82.

The spelling of 81369877612798 in words is "eighty-one trillion, three hundred sixty-nine billion, eight hundred seventy-seven million, six hundred twelve thousand, seven hundred ninety-eight".