681793837518 has 16 divisors (see below), whose sum is σ = 1443798714960. Its totient is φ = 213896105856.

The previous prime is 681793837511. The next prime is 681793837523. The reversal of 681793837518 is 815738397186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681793837511) 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, 3342126553 + ... + 3342126756.

It is an arithmetic number, because the mean of its divisors is an integer number (90237419685).

Almost surely, 2^681793837518 is an apocalyptic number.

681793837518 is an abundant number, since it is smaller than the sum of its proper divisors (762004877442).

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

681793837518 is a wasteful number, since it uses less digits than its factorization.

681793837518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6684253331.

The product of its digits is 60963840, while the sum is 66.

The spelling of 681793837518 in words is "six hundred eighty-one billion, seven hundred ninety-three million, eight hundred thirty-seven thousand, five hundred eighteen".