681356975872 has 36 divisors (see below), whose sum is σ = 1373518318536. Its totient is φ = 337305420800.

The previous prime is 681356975809. The next prime is 681356975899. The reversal of 681356975872 is 278579653186.

It is a junction number, because it is equal to n+sod(n) for n = 681356975798 and 681356975807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13150138 + ... + 13201849.

It is an arithmetic number, because the mean of its divisors is an integer number (38153286626).

Almost surely, 2^681356975872 is an apocalyptic number.

It is an amenable number.

681356975872 is an abundant number, since it is smaller than the sum of its proper divisors (692161342664).

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

681356975872 is a wasteful number, since it uses less digits than its factorization.

681356975872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26352104 (or 26352090 counting only the distinct ones).

The product of its digits is 152409600, while the sum is 67.

The spelling of 681356975872 in words is "six hundred eighty-one billion, three hundred fifty-six million, nine hundred seventy-five thousand, eight hundred seventy-two".