Hex #55ad9f or rgb(85,173,159) in RGB space is the tint of greenish cian. It has hue angle of 170.45 degrees, value = 68 and saturation = 51. #55ad9f can be obtained by mixing 4 colors: 5 drops of blue, 1 drop of cyan, 4 drops of green, 5 drops of white.
Nearest safe hex - #669999. Below you can see the block with #55ad9f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55ad9f to the mixer and play with it.