685414384217 has 2 divisors, whose sum is σ = 685414384218. Its totient is φ = 685414384216.

The previous prime is 685414384211. The next prime is 685414384267. The reversal of 685414384217 is 712483414586.

It is a happy number.

685414384217 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., 551973216601 + 133441167616 = 742949^2 + 365296^2 .

It is a cyclic number.

It is not a de Polignac number, because 685414384217 - 2¹⁶ = 685414318681 is a prime.

It is not a weakly prime, because it can be changed into another prime (685414384211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342707192108 + 342707192109.

It is an arithmetic number, because the mean of its divisors is an integer number (342707192109).

Almost surely, 2^685414384217 is an apocalyptic number.

It is an amenable number.

685414384217 is a deficient number, since it is larger than the sum of its proper divisors (1).

685414384217 is an equidigital number, since it uses as much as digits as its factorization.

685414384217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5160960, while the sum is 53.

The spelling of 685414384217 in words is "six hundred eighty-five billion, four hundred fourteen million, three hundred eighty-four thousand, two hundred seventeen".