68317121261 has 2 divisors, whose sum is σ = 68317121262. Its totient is φ = 68317121260.

The previous prime is 68317121207. The next prime is 68317121267. The reversal of 68317121261 is 16212171386.

68317121261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49292436361 + 19024684900 = 222019^2 + 137930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68317121261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68317121267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34158560630 + 34158560631.

It is an arithmetic number, because the mean of its divisors is an integer number (34158560631).

Almost surely, 2^68317121261 is an apocalyptic number.

It is an amenable number.

68317121261 is a deficient number, since it is larger than the sum of its proper divisors (1).

68317121261 is an equidigital number, since it uses as much as digits as its factorization.

68317121261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The spelling of 68317121261 in words is "sixty-eight billion, three hundred seventeen million, one hundred twenty-one thousand, two hundred sixty-one".