681857818732 has 12 divisors (see below), whose sum is σ = 1194503289336. Its totient is φ = 340571164640.

The previous prime is 681857818651. The next prime is 681857818751. The reversal of 681857818732 is 237818758186.

It is a super-3 number, since 3×681857818732³ (a number of 36 digits) contains 333 as substring.

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, 89431894 + ... + 89439517.

It is an arithmetic number, because the mean of its divisors is an integer number (99541940778).

Almost surely, 2^681857818732 is an apocalyptic number.

It is an amenable number.

681857818732 is a deficient number, since it is larger than the sum of its proper divisors (512645470604).

681857818732 is a wasteful number, since it uses less digits than its factorization.

681857818732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178872368 (or 178872366 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 64.

The spelling of 681857818732 in words is "six hundred eighty-one billion, eight hundred fifty-seven million, eight hundred eighteen thousand, seven hundred thirty-two".