685090606793 has 2 divisors, whose sum is σ = 685090606794. Its totient is φ = 685090606792.

The previous prime is 685090606789. The next prime is 685090606861. The reversal of 685090606793 is 397606090586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631878728464 + 53211878329 = 794908^2 + 230677^2 .

It is a cyclic number.

It is not a de Polignac number, because 685090606793 - 2² = 685090606789 is a prime.

It is not a weakly prime, because it can be changed into another prime (685090606723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342545303396 + 342545303397.

It is an arithmetic number, because the mean of its divisors is an integer number (342545303397).

Almost surely, 2^685090606793 is an apocalyptic number.

It is an amenable number.

685090606793 is a deficient number, since it is larger than the sum of its proper divisors (1).

685090606793 is an equidigital number, since it uses as much as digits as its factorization.

685090606793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14696640, while the sum is 59.

The spelling of 685090606793 in words is "six hundred eighty-five billion, ninety million, six hundred six thousand, seven hundred ninety-three".