Hex #557b77 or rgb(85,123,119) in RGB space is the tint of cyan. It has hue angle of 173.68 degrees, value = 48 and saturation = 31. #557b77 can be obtained by mixing 4 colors: 3 drops of blue, 2 drops of green, 5 drops of white, 5 drops of black.
Nearest safe hex - #666666. Below you can see the block with #557b77 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557b77 to the mixer and play with it.