681068113889 has 2 divisors, whose sum is σ = 681068113890. Its totient is φ = 681068113888.

The previous prime is 681068113871. The next prime is 681068113931. The reversal of 681068113889 is 988311860186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390865036864 + 290203077025 = 625192^2 + 538705^2 .

It is a cyclic number.

It is not a de Polignac number, because 681068113889 - 2⁸ = 681068113633 is a prime.

It is not a weakly prime, because it can be changed into another prime (681068113849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340534056944 + 340534056945.

It is an arithmetic number, because the mean of its divisors is an integer number (340534056945).

Almost surely, 2^681068113889 is an apocalyptic number.

It is an amenable number.

681068113889 is a deficient number, since it is larger than the sum of its proper divisors (1).

681068113889 is an equidigital number, since it uses as much as digits as its factorization.

681068113889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3981312, while the sum is 59.

The spelling of 681068113889 in words is "six hundred eighty-one billion, sixty-eight million, one hundred thirteen thousand, eight hundred eighty-nine".