684168851017 has 2 divisors, whose sum is σ = 684168851018. Its totient is φ = 684168851016.

The previous prime is 684168851011. The next prime is 684168851117. The reversal of 684168851017 is 710158861486.

684168851017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603132411456 + 81036439561 = 776616^2 + 284669^2 .

It is a cyclic number.

It is not a de Polignac number, because 684168851017 - 2¹¹ = 684168848969 is a prime.

It is not a weakly prime, because it can be changed into another prime (684168851011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342084425508 + 342084425509.

It is an arithmetic number, because the mean of its divisors is an integer number (342084425509).

Almost surely, 2^684168851017 is an apocalyptic number.

It is an amenable number.

684168851017 is a deficient number, since it is larger than the sum of its proper divisors (1).

684168851017 is an equidigital number, since it uses as much as digits as its factorization.

684168851017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 684168851017 in words is "six hundred eighty-four billion, one hundred sixty-eight million, eight hundred fifty-one thousand, seventeen".