Hex #559cb1 or rgb(85,156,177) in RGB space is the tint of bluish cian. It has hue angle of 193.70 degrees, value = 69 and saturation = 52. #559cb1 can be obtained by mixing 4 colors: 2 drops of blue, 3 drops of cyan, 4 drops of white, 3 drops of black.
Nearest safe hex - #669999. Below you can see the block with #559cb1 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559cb1 to the mixer and play with it.