Hex #556c39 or rgb(85,108,57) in RGB space is the tint of olive. It has hue angle of 87.06 degrees, value = 42 and saturation = 47. #556c39 can be obtained by mixing 4 colors: 1 drop of red, 2 drops of magenta, 1 drop of blue, 5 drops of green.
Nearest safe hex - #666633. Below you can see the block with #556c39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556c39 to the mixer and play with it.