Hex #55aa9c or rgb(85,170,156) in RGB space is the tint of greenish cian. It has hue angle of 170.12 degrees, value = 67 and saturation = 50. #55aa9c can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of red, 1 drop of blue, 3 drops of cyan.
Nearest safe hex - #669999. Below you can see the block with #55aa9c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55aa9c to the mixer and play with it.