81684745083704 has 64 divisors (see below), whose sum is σ = 177480016401600. Its totient is φ = 34521601618944.

The previous prime is 81684745083679. The next prime is 81684745083779. The reversal of 81684745083704 is 40738054748618.

It is a happy number.

81684745083704 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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, 20110667 + ... + 23828730.

It is an arithmetic number, because the mean of its divisors is an integer number (2773125256275).

Almost surely, 2^{81684745083704} is an apocalyptic number.

It is an amenable number.

81684745083704 is an abundant number, since it is smaller than the sum of its proper divisors (95795271317896).

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

81684745083704 is a wasteful number, since it uses less digits than its factorization.

81684745083704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43939872 (or 43939868 counting only the distinct ones).

The product of its (nonzero) digits is 144506880, while the sum is 65.

The spelling of 81684745083704 in words is "eighty-one trillion, six hundred eighty-four billion, seven hundred forty-five million, eighty-three thousand, seven hundred four".