685705235239 has 2 divisors, whose sum is σ = 685705235240. Its totient is φ = 685705235238.

The previous prime is 685705235209. The next prime is 685705235317. The reversal of 685705235239 is 932532507586.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685705235239 - 2⁹ = 685705234727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 685705235239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685705235209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342852617619 + 342852617620.

It is an arithmetic number, because the mean of its divisors is an integer number (342852617620).

Almost surely, 2^685705235239 is an apocalyptic number.

685705235239 is a deficient number, since it is larger than the sum of its proper divisors (1).

685705235239 is an equidigital number, since it uses as much as digits as its factorization.

685705235239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608000, while the sum is 55.

It can be divided in two parts, 68570 and 5235239, that added together give a square (5303809 = 2303²).

The spelling of 685705235239 in words is "six hundred eighty-five billion, seven hundred five million, two hundred thirty-five thousand, two hundred thirty-nine".