Hex #556142 or rgb(85,97,66) in RGB space is the tint of olive. It has hue angle of 83.23 degrees, value = 38 and saturation = 32. #556142 can be obtained by mixing 4 colors: 2 drops of yellow, 2 drops of blue, 1 drop of white, 4 drops of black.
Nearest safe hex - #666633. Below you can see the block with #556142 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556142 to the mixer and play with it.