Hex #557f39 or rgb(85,127,57) in RGB space is the tint of olive. It has hue angle of 96.00 degrees, value = 50 and saturation = 55. #557f39 can be obtained by mixing 4 colors: 5 drops of yellow, 5 drops of blue, 2 drops of green, 3 drops of black.
Nearest safe hex - #666633. Below you can see the block with #557f39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557f39 to the mixer and play with it.