68461735109 has 2 divisors, whose sum is σ = 68461735110. Its totient is φ = 68461735108.

The previous prime is 68461735057. The next prime is 68461735151. The reversal of 68461735109 is 90153716486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66414444100 + 2047291009 = 257710^2 + 45247^2 .

It is a cyclic number.

It is not a de Polignac number, because 68461735109 - 2²⁸ = 68193299653 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68467735109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34230867554 + 34230867555.

It is an arithmetic number, because the mean of its divisors is an integer number (34230867555).

Almost surely, 2^68461735109 is an apocalyptic number.

It is an amenable number.

68461735109 is a deficient number, since it is larger than the sum of its proper divisors (1).

68461735109 is an equidigital number, since it uses as much as digits as its factorization.

68461735109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 68461735109 in words is "sixty-eight billion, four hundred sixty-one million, seven hundred thirty-five thousand, one hundred nine".