Hex #557172 or rgb(85,113,114) in RGB space is the tint of cyan. It has hue angle of 182.07 degrees, value = 45 and saturation = 25. #557172 can be obtained by mixing 4 colors: 3 drops of magenta, 2 drops of cyan, 3 drops of green, 1 drop of black.
Nearest safe hex - #666666. Below you can see the block with #557172 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557172 to the mixer and play with it.