681308878164 has 24 divisors (see below), whose sum is σ = 1594275799200. Its totient is φ = 226452233184.

The previous prime is 681308878147. The next prime is 681308878193. The reversal of 681308878164 is 461878803186.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 681308878098 and 681308878107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81336414 + ... + 81344789.

It is an arithmetic number, because the mean of its divisors is an integer number (66428158300).

Almost surely, 2^681308878164 is an apocalyptic number.

It is an amenable number.

681308878164 is an abundant number, since it is smaller than the sum of its proper divisors (912966921036).

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

681308878164 is a wasteful number, since it uses less digits than its factorization.

681308878164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162681559 (or 162681557 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 60.

The spelling of 681308878164 in words is "six hundred eighty-one billion, three hundred eight million, eight hundred seventy-eight thousand, one hundred sixty-four".