681545821736 has 32 divisors (see below), whose sum is σ = 1436033007360. Its totient is φ = 300883104192.

The previous prime is 681545821721. The next prime is 681545821753. The reversal of 681545821736 is 637128545186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142461200 + ... + 142465983.

It is an arithmetic number, because the mean of its divisors is an integer number (44876031480).

Almost surely, 2^681545821736 is an apocalyptic number.

It is an amenable number.

681545821736 is an abundant number, since it is smaller than the sum of its proper divisors (754487185624).

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

681545821736 is a wasteful number, since it uses less digits than its factorization.

681545821736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284927225 (or 284927221 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 56.

The spelling of 681545821736 in words is "six hundred eighty-one billion, five hundred forty-five million, eight hundred twenty-one thousand, seven hundred thirty-six".