Hex #559487 or rgb(85,148,135) in RGB space is the tint of greenish cian. It has hue angle of 167.62 degrees, value = 58 and saturation = 43. #559487 can be obtained by mixing 4 colors: 1 drop of magenta, 4 drops of blue, 4 drops of green, 3 drops of white.
Nearest safe hex - #669999. Below you can see the block with #559487 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559487 to the mixer and play with it.