685209210589417 has 2 divisors, whose sum is σ = 685209210589418. Its totient is φ = 685209210589416.

The previous prime is 685209210589411. The next prime is 685209210589459. The reversal of 685209210589417 is 714985012902586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680845640534361 + 4363570055056 = 26093019^2 + 2088916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685209210589417 is a prime.

It is not a weakly prime, because it can be changed into another prime (685209210589411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342604605294708 + 342604605294709.

It is an arithmetic number, because the mean of its divisors is an integer number (342604605294709).

Almost surely, 2^{685209210589417} is an apocalyptic number.

It is an amenable number.

685209210589417 is a deficient number, since it is larger than the sum of its proper divisors (1).

685209210589417 is an equidigital number, since it uses as much as digits as its factorization.

685209210589417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87091200, while the sum is 67.

The spelling of 685209210589417 in words is "six hundred eighty-five trillion, two hundred nine billion, two hundred ten million, five hundred eighty-nine thousand, four hundred seventeen".