Hex #557c56 or rgb(85,124,86) in RGB space is the tint of green. It has hue angle of 121.54 degrees, value = 49 and saturation = 31. #557c56 can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of magenta, 2 drops of blue, 2 drops of green.
Nearest safe hex - #666666. Below you can see the block with #557c56 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557c56 to the mixer and play with it.