Hex #55a000 or rgb(85,160,0) in RGB space is the tint of olive. It has hue angle of 88.13 degrees, value = 63 and saturation = 100. #55a000 can be obtained by mixing 3 colors: 1 drop of yellow, 1 drop of red, 4 drops of green.
Nearest safe hex - #669900. Below you can see the block with #55a000 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55a000 to the mixer and play with it.