Hex #557f2f or rgb(85,127,47) in RGB space is the tint of olive. It has hue angle of 91.50 degrees, value = 50 and saturation = 63. #557f2f can be obtained by mixing 4 colors: 2 drops of red, 1 drop of magenta, 1 drop of cyan, 5 drops of green.
Nearest safe hex - #666633. Below you can see the block with #557f2f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557f2f to the mixer and play with it.