81317412186 has 16 divisors (see below), whose sum is σ = 162883890144. Its totient is φ = 27064293104.

The previous prime is 81317412167. The next prime is 81317412223. The reversal of 81317412186 is 68121471318.

It is a super-2 number, since 2×81317412186² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10373496 + ... + 10381331.

It is an arithmetic number, because the mean of its divisors is an integer number (10180243134).

Almost surely, 2^81317412186 is an apocalyptic number.

81317412186 is an abundant number, since it is smaller than the sum of its proper divisors (81566477958).

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

81317412186 is a wasteful number, since it uses less digits than its factorization.

81317412186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20755485.

The product of its digits is 64512, while the sum is 42.

The spelling of 81317412186 in words is "eighty-one billion, three hundred seventeen million, four hundred twelve thousand, one hundred eighty-six".