681517418068 has 24 divisors (see below), whose sum is σ = 1194072358752. Its totient is φ = 340354133664.

The previous prime is 681517418063. The next prime is 681517418089. The reversal of 681517418068 is 860814715186.

681517418068 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 2×681517418068² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681517418063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11672155 + ... + 11730397.

It is an arithmetic number, because the mean of its divisors is an integer number (49753014948).

Almost surely, 2^681517418068 is an apocalyptic number.

It is an amenable number.

681517418068 is a deficient number, since it is larger than the sum of its proper divisors (512554940684).

681517418068 is a wasteful number, since it uses less digits than its factorization.

681517418068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61671 (or 61669 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 681517418068 in words is "six hundred eighty-one billion, five hundred seventeen million, four hundred eighteen thousand, sixty-eight".