Hex #559398 or rgb(85,147,152) in RGB space is the tint of cyan. It has hue angle of 184.48 degrees, value = 60 and saturation = 44. #559398 can be obtained by mixing 4 colors: 2 drops of yellow, 5 drops of blue, 1 drop of cyan, 1 drop of white.
Nearest safe hex - #669999. Below you can see the block with #559398 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559398 to the mixer and play with it.