Hex #55a99c or rgb(85,169,156) in RGB space is the tint of greenish cian. It has hue angle of 170.71 degrees, value = 66 and saturation = 50. #55a99c can be obtained by mixing 4 colors: 3 drops of yellow, 5 drops of blue, 3 drops of cyan, 1 drop of white.
Nearest safe hex - #669999. Below you can see the block with #55a99c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55a99c to the mixer and play with it.