68140740881 has 2 divisors, whose sum is σ = 68140740882. Its totient is φ = 68140740880.

The previous prime is 68140740869. The next prime is 68140740887. The reversal of 68140740881 is 18804704186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58814010256 + 9326730625 = 242516^2 + 96575^2 .

It is a cyclic number.

It is not a de Polignac number, because 68140740881 - 2²⁶ = 68073632017 is a prime.

It is a super-2 number, since 2×68140740881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68140740887) 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, 34070370440 + 34070370441.

It is an arithmetic number, because the mean of its divisors is an integer number (34070370441).

Almost surely, 2^68140740881 is an apocalyptic number.

It is an amenable number.

68140740881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68140740881 is an equidigital number, since it uses as much as digits as its factorization.

68140740881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 344064, while the sum is 47.

The spelling of 68140740881 in words is "sixty-eight billion, one hundred forty million, seven hundred forty thousand, eight hundred eighty-one".