681393675568 has 20 divisors (see below), whose sum is σ = 1329836748840. Its totient is φ = 338209998464.

The previous prime is 681393675493. The next prime is 681393675569. The reversal of 681393675568 is 865576393186.

681393675568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×681393675568² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681393675569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155425198 + ... + 155429581.

It is an arithmetic number, because the mean of its divisors is an integer number (66491837442).

Almost surely, 2^681393675568 is an apocalyptic number.

It is an amenable number.

681393675568 is a deficient number, since it is larger than the sum of its proper divisors (648443073272).

681393675568 is a wasteful number, since it uses less digits than its factorization.

681393675568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310854924 (or 310854918 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 67.

The spelling of 681393675568 in words is "six hundred eighty-one billion, three hundred ninety-three million, six hundred seventy-five thousand, five hundred sixty-eight".