681281136781 has 48 divisors (see below), whose sum is σ = 817940661120. Its totient is φ = 565463324160.

The previous prime is 681281136773. The next prime is 681281136791. The reversal of 681281136781 is 187631182186.

681281136781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681281136781 - 2³ = 681281136773 is a prime.

It is a super-2 number, since 2×681281136781² (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 (681281136751) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 372080536 + ... + 372082366.

It is an arithmetic number, because the mean of its divisors is an integer number (17040430440).

Almost surely, 2^681281136781 is an apocalyptic number.

It is an amenable number.

681281136781 is a deficient number, since it is larger than the sum of its proper divisors (136659524339).

681281136781 is a wasteful number, since it uses less digits than its factorization.

681281136781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3314 (or 3307 counting only the distinct ones).

The product of its digits is 774144, while the sum is 52.

The spelling of 681281136781 in words is "six hundred eighty-one billion, two hundred eighty-one million, one hundred thirty-six thousand, seven hundred eighty-one".