681468068068 has 36 divisors (see below), whose sum is σ = 1202555408292. Its totient is φ = 337899356160.

The previous prime is 681468068063. The next prime is 681468068077. The reversal of 681468068068 is 860860864186.

It can be written as a sum of positive squares in 6 ways, for example, as 136576071844 + 544891996224 = 369562^2 + 738168^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681468067997 and 681468068015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681468068063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53903028 + ... + 53915668.

It is an arithmetic number, because the mean of its divisors is an integer number (33404316897).

Almost surely, 2^681468068068 is an apocalyptic number.

It is an amenable number.

681468068068 is a deficient number, since it is larger than the sum of its proper divisors (521087340224).

681468068068 is a wasteful number, since it uses less digits than its factorization.

681468068068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13360 (or 13129 counting only the distinct ones).

The product of its (nonzero) digits is 21233664, while the sum is 61.

The spelling of 681468068068 in words is "six hundred eighty-one billion, four hundred sixty-eight million, sixty-eight thousand, sixty-eight".