168311606857 has 2 divisors, whose sum is σ = 168311606858. Its totient is φ = 168311606856.

The previous prime is 168311606843. The next prime is 168311606891. The reversal of 168311606857 is 758606113861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168051623481 + 259983376 = 409941^2 + 16124^2 .

It is a cyclic number.

It is not a de Polignac number, because 168311606857 - 2¹⁵ = 168311574089 is a prime.

It is not a weakly prime, because it can be changed into another prime (168311606557) 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, 84155803428 + 84155803429.

It is an arithmetic number, because the mean of its divisors is an integer number (84155803429).

Almost surely, 2^168311606857 is an apocalyptic number.

It is an amenable number.

168311606857 is a deficient number, since it is larger than the sum of its proper divisors (1).

168311606857 is an equidigital number, since it uses as much as digits as its factorization.

168311606857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 168311606857 in words is "one hundred sixty-eight billion, three hundred eleven million, six hundred six thousand, eight hundred fifty-seven".