68840820317 has 2 divisors, whose sum is σ = 68840820318. Its totient is φ = 68840820316.

The previous prime is 68840820271. The next prime is 68840820329. The reversal of 68840820317 is 71302804886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58830017401 + 10010802916 = 242549^2 + 100054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68840820317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68848820317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34420410158 + 34420410159.

It is an arithmetic number, because the mean of its divisors is an integer number (34420410159).

Almost surely, 2^68840820317 is an apocalyptic number.

It is an amenable number.

68840820317 is a deficient number, since it is larger than the sum of its proper divisors (1).

68840820317 is an equidigital number, since it uses as much as digits as its factorization.

68840820317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 68840820317 in words is "sixty-eight billion, eight hundred forty million, eight hundred twenty thousand, three hundred seventeen".