681868994093 has 64 divisors (see below), whose sum is σ = 870285312000. Its totient is φ = 531619925760.

The previous prime is 681868994089. The next prime is 681868994099. The reversal of 681868994093 is 390499868186.

681868994093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681868994093 - 2² = 681868994089 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 (681868994099) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 163948148 + ... + 163952306.

It is an arithmetic number, because the mean of its divisors is an integer number (13598208000).

Almost surely, 2^681868994093 is an apocalyptic number.

It is an amenable number.

681868994093 is a deficient number, since it is larger than the sum of its proper divisors (188416317907).

681868994093 is a wasteful number, since it uses less digits than its factorization.

681868994093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135 (or 5121 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 71.

The spelling of 681868994093 in words is "six hundred eighty-one billion, eight hundred sixty-eight million, nine hundred ninety-four thousand, ninety-three".