8681568397 has 2 divisors, whose sum is σ = 8681568398. Its totient is φ = 8681568396.

The previous prime is 8681568317. The next prime is 8681568419. The reversal of 8681568397 is 7938651868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8665934281 + 15634116 = 93091^2 + 3954^2 .

It is a cyclic number.

It is not a de Polignac number, because 8681568397 - 2¹¹ = 8681566349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8681568307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4340784198 + 4340784199.

It is an arithmetic number, because the mean of its divisors is an integer number (4340784199).

Almost surely, 2^8681568397 is an apocalyptic number.

It is an amenable number.

8681568397 is a deficient number, since it is larger than the sum of its proper divisors (1).

8681568397 is an equidigital number, since it uses as much as digits as its factorization.

8681568397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17418240, while the sum is 61.

The square root of 8681568397 is about 93174.9343815170. The cubic root of 8681568397 is about 2055.2566577177.

The spelling of 8681568397 in words is "eight billion, six hundred eighty-one million, five hundred sixty-eight thousand, three hundred ninety-seven".