685220700589 has 2 divisors, whose sum is σ = 685220700590. Its totient is φ = 685220700588.

The previous prime is 685220700569. The next prime is 685220700607. The reversal of 685220700589 is 985007022586.

685220700589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425893286025 + 259327414564 = 652605^2 + 509242^2 .

It is a cyclic number.

It is not a de Polignac number, because 685220700589 - 2¹³ = 685220692397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685220700509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342610350294 + 342610350295.

It is an arithmetic number, because the mean of its divisors is an integer number (342610350295).

Almost surely, 2^685220700589 is an apocalyptic number.

It is an amenable number.

685220700589 is a deficient number, since it is larger than the sum of its proper divisors (1).

685220700589 is an equidigital number, since it uses as much as digits as its factorization.

685220700589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 685220700589 in words is "six hundred eighty-five billion, two hundred twenty million, seven hundred thousand, five hundred eighty-nine".