68496716909 has 2 divisors, whose sum is σ = 68496716910. Its totient is φ = 68496716908.

The previous prime is 68496716887. The next prime is 68496717019. The reversal of 68496716909 is 90961769486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56016475684 + 12480241225 = 236678^2 + 111715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68496716909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68496716609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34248358454 + 34248358455.

It is an arithmetic number, because the mean of its divisors is an integer number (34248358455).

Almost surely, 2^68496716909 is an apocalyptic number.

It is an amenable number.

68496716909 is a deficient number, since it is larger than the sum of its proper divisors (1).

68496716909 is an equidigital number, since it uses as much as digits as its factorization.

68496716909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35271936, while the sum is 65.

The spelling of 68496716909 in words is "sixty-eight billion, four hundred ninety-six million, seven hundred sixteen thousand, nine hundred nine".