681852851899631 has 16 divisors (see below), whose sum is σ = 691918943385600. Its totient is φ = 671799645888000.

The previous prime is 681852851899603. The next prime is 681852851899691. The reversal of 681852851899631 is 136998158258186.

It is a happy number.

681852851899631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 681852851899631 - 2¹⁸ = 681852851637487 is a prime.

It is a super-2 number, since 2×681852851899631² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681852851899691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2832447290 + ... + 2832688008.

It is an arithmetic number, because the mean of its divisors is an integer number (43244933961600).

Almost surely, 2^{681852851899631} is an apocalyptic number.

681852851899631 is a deficient number, since it is larger than the sum of its proper divisors (10066091485969).

681852851899631 is a wasteful number, since it uses less digits than its factorization.

681852851899631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267310.

The product of its digits is 1791590400, while the sum is 80.

The spelling of 681852851899631 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-one".