Hex #556642 or rgb(85,102,66) in RGB space is the tint of olive. It has hue angle of 88.33 degrees, value = 40 and saturation = 35. #556642 can be obtained by mixing 4 colors: 3 drops of red, 2 drops of blue, 1 drop of cyan, 3 drops of green.
Nearest safe hex - #666633. Below you can see the block with #556642 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556642 to the mixer and play with it.