Hex #55ac97 or rgb(85,172,151) in RGB space is the tint of greenish cian. It has hue angle of 165.52 degrees, value = 67 and saturation = 51. #55ac97 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of magenta, 4 drops of cyan, 2 drops of green.
Nearest safe hex - #669999. Below you can see the block with #55ac97 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55ac97 to the mixer and play with it.