68140740809 has 2 divisors, whose sum is σ = 68140740810. Its totient is φ = 68140740808.

The previous prime is 68140740797. The next prime is 68140740821. The reversal of 68140740809 is 90804704186.

68140740809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (68140740797) and next prime (68140740821).

It can be written as a sum of positive squares in only one way, i.e., 67705601209 + 435139600 = 260203^2 + 20860^2 .

It is a cyclic number.

It is not a de Polignac number, because 68140740809 - 2⁸ = 68140740553 is a prime.

It is not a weakly prime, because it can be changed into another prime (68140740869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34070370404 + 34070370405.

It is an arithmetic number, because the mean of its divisors is an integer number (34070370405).

Almost surely, 2^68140740809 is an apocalyptic number.

It is an amenable number.

68140740809 is a deficient number, since it is larger than the sum of its proper divisors (1).

68140740809 is an equidigital number, since it uses as much as digits as its factorization.

68140740809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 68140740809 in words is "sixty-eight billion, one hundred forty million, seven hundred forty thousand, eight hundred nine".