68556128257 has 2 divisors, whose sum is σ = 68556128258. Its totient is φ = 68556128256.

The previous prime is 68556128237. The next prime is 68556128287. The reversal of 68556128257 is 75282165586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51315387841 + 17240740416 = 226529^2 + 131304^2 .

It is a cyclic number.

It is not a de Polignac number, because 68556128257 - 2¹⁹ = 68555603969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68556128198 and 68556128207.

It is not a weakly prime, because it can be changed into another prime (68556128237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34278064128 + 34278064129.

It is an arithmetic number, because the mean of its divisors is an integer number (34278064129).

Almost surely, 2^68556128257 is an apocalyptic number.

It is an amenable number.

68556128257 is a deficient number, since it is larger than the sum of its proper divisors (1).

68556128257 is an equidigital number, since it uses as much as digits as its factorization.

68556128257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064000, while the sum is 55.

The spelling of 68556128257 in words is "sixty-eight billion, five hundred fifty-six million, one hundred twenty-eight thousand, two hundred fifty-seven".