Hex #558985 or rgb(85,137,133) in RGB space is the tint of cyan. It has hue angle of 175.38 degrees, value = 54 and saturation = 38. #558985 can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of red, 4 drops of blue, 2 drops of cyan.
Nearest safe hex - #669999. Below you can see the block with #558985 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558985 to the mixer and play with it.