686843507017 has 2 divisors, whose sum is σ = 686843507018. Its totient is φ = 686843507016.

The previous prime is 686843506963. The next prime is 686843507041. The reversal of 686843507017 is 710705348686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628791905296 + 58051601721 = 792964^2 + 240939^2 .

It is a cyclic number.

It is not a de Polignac number, because 686843507017 - 2¹⁹ = 686842982729 is a prime.

It is not a weakly prime, because it can be changed into another prime (686843507617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343421753508 + 343421753509.

It is an arithmetic number, because the mean of its divisors is an integer number (343421753509).

Almost surely, 2^686843507017 is an apocalyptic number.

It is an amenable number.

686843507017 is a deficient number, since it is larger than the sum of its proper divisors (1).

686843507017 is an equidigital number, since it uses as much as digits as its factorization.

686843507017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 686843507017 in words is "six hundred eighty-six billion, eight hundred forty-three million, five hundred seven thousand, seventeen".