681641903713 has 2 divisors, whose sum is σ = 681641903714. Its totient is φ = 681641903712.

The previous prime is 681641903693. The next prime is 681641903759. The reversal of 681641903713 is 317309146186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676756313104 + 4885590609 = 822652^2 + 69897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681641903713 is a prime.

It is not a weakly prime, because it can be changed into another prime (681641903773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340820951856 + 340820951857.

It is an arithmetic number, because the mean of its divisors is an integer number (340820951857).

Almost surely, 2^681641903713 is an apocalyptic number.

It is an amenable number.

681641903713 is a deficient number, since it is larger than the sum of its proper divisors (1).

681641903713 is an equidigital number, since it uses as much as digits as its factorization.

681641903713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 681641903713 in words is "six hundred eighty-one billion, six hundred forty-one million, nine hundred three thousand, seven hundred thirteen".