68140740869 has 2 divisors, whose sum is σ = 68140740870. Its totient is φ = 68140740868.

The previous prime is 68140740847. The next prime is 68140740881. The reversal of 68140740869 is 96804704186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64865467969 + 3275272900 = 254687^2 + 57230^2 .

It is a cyclic number.

It is not a de Polignac number, because 68140740869 - 2²⁴ = 68123963653 is a prime.

It is a super-2 number, since 2×68140740869² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68140740869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68140740809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34070370434 + 34070370435.

It is an arithmetic number, because the mean of its divisors is an integer number (34070370435).

Almost surely, 2^68140740869 is an apocalyptic number.

It is an amenable number.

68140740869 is a deficient number, since it is larger than the sum of its proper divisors (1).

68140740869 is an equidigital number, since it uses as much as digits as its factorization.

68140740869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 68140740869 in words is "sixty-eight billion, one hundred forty million, seven hundred forty thousand, eight hundred sixty-nine".