681852851899632 has 320 divisors, whose sum is σ = 2273509063091200. Its totient is φ = 191615105848320.

The previous prime is 681852851899603. The next prime is 681852851899691. The reversal of 681852851899632 is 236998158258186.

681852851899632 is a `hidden beast` number, since 6 + 8 + 1 + 8 + 5 + 2 + 8 + 518 + 9 + 96 + 3 + 2 = 666.

It is a super-2 number, since 2×681852851899632² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11013761094 + ... + 11013823002.

It is an arithmetic number, because the mean of its divisors is an integer number (7104715822160).

Almost surely, 2^{681852851899632} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681852851899632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136754531545600).

681852851899632 is an abundant number, since it is smaller than the sum of its proper divisors (1591656211191568).

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

681852851899632 is a wasteful number, since it uses less digits than its factorization.

681852851899632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121701 (or 121689 counting only the distinct ones).

The product of its digits is 3583180800, while the sum is 81.

The spelling of 681852851899632 in words is "six hundred eighty-one trillion, eight hundred fifty-two billion, eight hundred fifty-one million, eight hundred ninety-nine thousand, six hundred thirty-two".