68935991742809 has 2 divisors, whose sum is σ = 68935991742810. Its totient is φ = 68935991742808.

The previous prime is 68935991742799. The next prime is 68935991742841. The reversal of 68935991742809 is 90824719953986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65010033894400 + 3925957848409 = 8062880^2 + 1981403^2 .

It is a cyclic number.

It is not a de Polignac number, because 68935991742809 - 2²⁴ = 68935974965593 is a prime.

It is not a weakly prime, because it can be changed into another prime (68935991742869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34467995871404 + 34467995871405.

It is an arithmetic number, because the mean of its divisors is an integer number (34467995871405).

It is a 1-persistent number, because it is pandigital, but 2⋅68935991742809 = 137871983485618 is not.

Almost surely, 2^{68935991742809} is an apocalyptic number.

It is an amenable number.

68935991742809 is a deficient number, since it is larger than the sum of its proper divisors (1).

68935991742809 is an equidigital number, since it uses as much as digits as its factorization.

68935991742809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116316160, while the sum is 80.

The spelling of 68935991742809 in words is "sixty-eight trillion, nine hundred thirty-five billion, nine hundred ninety-one million, seven hundred forty-two thousand, eight hundred nine".