Hex #55a699 or rgb(85,166,153) in RGB space is the tint of greenish cian. It has hue angle of 170.37 degrees, value = 65 and saturation = 49. #55a699 can be obtained by mixing 4 colors: 4 drops of yellow, 1 drop of magenta, 5 drops of blue, 5 drops of cyan.
Nearest safe hex - #669999. Below you can see the block with #55a699 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55a699 to the mixer and play with it.