68178485257 has 2 divisors, whose sum is σ = 68178485258. Its totient is φ = 68178485256.

The previous prime is 68178485237. The next prime is 68178485293. The reversal of 68178485257 is 75258487186.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45206839161 + 22971646096 = 212619^2 + 151564^2 .

It is a cyclic number.

It is not a de Polignac number, because 68178485257 - 2⁷ = 68178485129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68178485195 and 68178485204.

It is not a weakly prime, because it can be changed into another prime (68178485237) 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, 34089242628 + 34089242629.

It is an arithmetic number, because the mean of its divisors is an integer number (34089242629).

Almost surely, 2^68178485257 is an apocalyptic number.

It is an amenable number.

68178485257 is a deficient number, since it is larger than the sum of its proper divisors (1).

68178485257 is an equidigital number, since it uses as much as digits as its factorization.

68178485257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30105600, while the sum is 61.

The spelling of 68178485257 in words is "sixty-eight billion, one hundred seventy-eight million, four hundred eighty-five thousand, two hundred fifty-seven".