Hex #556a44 or rgb(85,106,68) in RGB space is the tint of olive. It has hue angle of 93.16 degrees, value = 42 and saturation = 36. #556a44 can be obtained by mixing 4 colors: 5 drops of red, 3 drops of blue, 2 drops of cyan, 5 drops of green.
Nearest safe hex - #666633. Below you can see the block with #556a44 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556a44 to the mixer and play with it.