685332733733 has 2 divisors, whose sum is σ = 685332733734. Its totient is φ = 685332733732.

The previous prime is 685332733661. The next prime is 685332733753. The reversal of 685332733733 is 337337233586.

685332733733 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., 545185826689 + 140146907044 = 738367^2 + 374362^2 .

It is a cyclic number.

It is not a de Polignac number, because 685332733733 - 2¹⁸ = 685332471589 is a prime.

It is a super-2 number, since 2×685332733733² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685332733753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342666366866 + 342666366867.

It is an arithmetic number, because the mean of its divisors is an integer number (342666366867).

Almost surely, 2^685332733733 is an apocalyptic number.

It is an amenable number.

685332733733 is a deficient number, since it is larger than the sum of its proper divisors (1).

685332733733 is an equidigital number, since it uses as much as digits as its factorization.

685332733733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 53.

The spelling of 685332733733 in words is "six hundred eighty-five billion, three hundred thirty-two million, seven hundred thirty-three thousand, seven hundred thirty-three".