Hex #558917 or rgb(85,137,23) in RGB space is the tint of olive. It has hue angle of 87.37 degrees, value = 54 and saturation = 83. #558917 can be obtained by mixing 4 colors: 5 drops of yellow, 2 drops of blue, 4 drops of green, 4 drops of black.
Nearest safe hex - #669900. Below you can see the block with #558917 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558917 to the mixer and play with it.