81115718795 has 32 divisors (see below), whose sum is σ = 100099741632. Its totient is φ = 63067963392.

The previous prime is 81115718777. The next prime is 81115718797. The reversal of 81115718795 is 59781751118.

It is a cyclic number.

It is not a de Polignac number, because 81115718795 - 2¹⁸ = 81115456651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81115718797) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46271639 + ... + 46273391.

It is an arithmetic number, because the mean of its divisors is an integer number (3128116926).

Almost surely, 2^81115718795 is an apocalyptic number.

81115718795 is a deficient number, since it is larger than the sum of its proper divisors (18984022837).

81115718795 is a wasteful number, since it uses less digits than its factorization.

81115718795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751.

The product of its digits is 705600, while the sum is 53.

The spelling of 81115718795 in words is "eighty-one billion, one hundred fifteen million, seven hundred eighteen thousand, seven hundred ninety-five".