Hex #557139 or rgb(85,113,57) in RGB space is the tint of olive. It has hue angle of 90.00 degrees, value = 44 and saturation = 50. #557139 can be obtained by mixing 4 colors: 3 drops of red, 2 drops of cyan, 3 drops of green, 1 drop of black.
Nearest safe hex - #666633. Below you can see the block with #557139 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557139 to the mixer and play with it.