Hex #559087 or rgb(85,144,135) in RGB space is the tint of greenish cian. It has hue angle of 170.85 degrees, value = 56 and saturation = 41. #559087 can be obtained by mixing 4 colors: 2 drops of red, 2 drops of magenta, 5 drops of cyan, 3 drops of green.
Nearest safe hex - #669999. Below you can see the block with #559087 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559087 to the mixer and play with it.