685536037789 has 2 divisors, whose sum is σ = 685536037790. Its totient is φ = 685536037788.

The previous prime is 685536037763. The next prime is 685536037853. The reversal of 685536037789 is 987730635586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662709964900 + 22826072889 = 814070^2 + 151083^2 .

It is a cyclic number.

It is not a de Polignac number, because 685536037789 - 2⁵ = 685536037757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685536337789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342768018894 + 342768018895.

It is an arithmetic number, because the mean of its divisors is an integer number (342768018895).

Almost surely, 2^685536037789 is an apocalyptic number.

It is an amenable number.

685536037789 is a deficient number, since it is larger than the sum of its proper divisors (1).

685536037789 is an equidigital number, since it uses as much as digits as its factorization.

685536037789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 228614400, while the sum is 67.

The spelling of 685536037789 in words is "six hundred eighty-five billion, five hundred thirty-six million, thirty-seven thousand, seven hundred eighty-nine".