Hex #557f13 or rgb(85,127,19) in RGB space is the tint of olive. It has hue angle of 83.33 degrees, value = 50 and saturation = 85. #557f13 can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of blue, 2 drops of green, 3 drops of black.
Nearest safe hex - #666600. Below you can see the block with #557f13 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557f13 to the mixer and play with it.