68756881261 has 2 divisors, whose sum is σ = 68756881262. Its totient is φ = 68756881260.

The previous prime is 68756881213. The next prime is 68756881273. The reversal of 68756881261 is 16218865786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68503116361 + 253764900 = 261731^2 + 15930^2 .

It is a cyclic number.

It is not a de Polignac number, because 68756881261 - 2⁷ = 68756881133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68756881196 and 68756881205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68756881201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34378440630 + 34378440631.

It is an arithmetic number, because the mean of its divisors is an integer number (34378440631).

Almost surely, 2^68756881261 is an apocalyptic number.

It is an amenable number.

68756881261 is a deficient number, since it is larger than the sum of its proper divisors (1).

68756881261 is an equidigital number, since it uses as much as digits as its factorization.

68756881261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 58.

The spelling of 68756881261 in words is "sixty-eight billion, seven hundred fifty-six million, eight hundred eighty-one thousand, two hundred sixty-one".