685884622849 has 2 divisors, whose sum is σ = 685884622850. Its totient is φ = 685884622848.

The previous prime is 685884622793. The next prime is 685884622859. The reversal of 685884622849 is 948226488586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529023475600 + 156861147249 = 727340^2 + 396057^2 .

It is a cyclic number.

It is not a de Polignac number, because 685884622849 - 2⁹ = 685884622337 is a prime.

It is not a weakly prime, because it can be changed into another prime (685884622859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342942311424 + 342942311425.

It is an arithmetic number, because the mean of its divisors is an integer number (342942311425).

Almost surely, 2^685884622849 is an apocalyptic number.

It is an amenable number.

685884622849 is a deficient number, since it is larger than the sum of its proper divisors (1).

685884622849 is an equidigital number, since it uses as much as digits as its factorization.

685884622849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 424673280, while the sum is 70.

The spelling of 685884622849 in words is "six hundred eighty-five billion, eight hundred eighty-four million, six hundred twenty-two thousand, eight hundred forty-nine".