81336073917 has 16 divisors (see below), whose sum is σ = 125077758080. Its totient is φ = 46051353792.

The previous prime is 81336073913. The next prime is 81336073937. The reversal of 81336073917 is 71937063318.

It is not a de Polignac number, because 81336073917 - 2² = 81336073913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81336073913) 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, 17764438 + ... + 17769015.

It is an arithmetic number, because the mean of its divisors is an integer number (7817359880).

Almost surely, 2^81336073917 is an apocalyptic number.

It is an amenable number.

81336073917 is a deficient number, since it is larger than the sum of its proper divisors (43741684163).

81336073917 is a wasteful number, since it uses less digits than its factorization.

81336073917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35533572.

The product of its (nonzero) digits is 571536, while the sum is 48.

The spelling of 81336073917 in words is "eighty-one billion, three hundred thirty-six million, seventy-three thousand, nine hundred seventeen".