Hex #558656 or rgb(85,134,86) in RGB space is the tint of green. It has hue angle of 121.22 degrees, value = 53 and saturation = 37. #558656 can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of magenta, 5 drops of blue, 3 drops of green.
Nearest safe hex - #669966. Below you can see the block with #558656 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558656 to the mixer and play with it.