Hex #556f44 or rgb(85,111,68) in RGB space is the tint of olive. It has hue angle of 96.28 degrees, value = 44 and saturation = 39. #556f44 can be obtained by mixing 4 colors: 5 drops of red, 4 drops of cyan, 4 drops of green, 2 drops of black.
Nearest safe hex - #666633. Below you can see the block with #556f44 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556f44 to the mixer and play with it.