Hex #55a840 or rgb(85,168,64) in RGB space is the tint of grass green. It has hue angle of 107.88 degrees, value = 66 and saturation = 62. #55a840 can be obtained by mixing 4 colors: 4 drops of yellow, 3 drops of cyan, 2 drops of green, 3 drops of black.
Nearest safe hex - #669933. Below you can see the block with #55a840 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55a840 to the mixer and play with it.