Hex #558085 or rgb(85,128,133) in RGB space is the tint of cyan. It has hue angle of 186.25 degrees, value = 52 and saturation = 36. #558085 can be obtained by mixing 4 colors: 1 drop of red, 4 drops of blue, 2 drops of green, 2 drops of white.
Nearest safe hex - #669999. Below you can see the block with #558085 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558085 to the mixer and play with it.