Hex #557d44 or rgb(85,125,68) in RGB space is the tint of grass green. It has hue angle of 102.11 degrees, value = 49 and saturation = 46. #557d44 can be obtained by mixing 4 colors: 5 drops of yellow, 3 drops of blue, 2 drops of cyan, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #557d44 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557d44 to the mixer and play with it.