Hex #55971d or rgb(85,151,29) in RGB space is the tint of olive. It has hue angle of 92.46 degrees, value = 59 and saturation = 81. #55971d can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of blue, 2 drops of green, 1 drop of black.
Nearest safe hex - #669933. Below you can see the block with #55971d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55971d to the mixer and play with it.