Hex #556340 or rgb(85,99,64) in RGB space is the tint of olive. It has hue angle of 84.00 degrees, value = 39 and saturation = 35. #556340 can be obtained by mixing 4 colors: 2 drops of yellow, 2 drops of red, 3 drops of cyan, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #556340 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556340 to the mixer and play with it.