Hex #557f26 or rgb(85,127,38) in RGB space is the tint of olive. It has hue angle of 88.31 degrees, value = 50 and saturation = 70. #557f26 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of magenta, 5 drops of green, 1 drop of black.
Nearest safe hex - #666633. Below you can see the block with #557f26 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557f26 to the mixer and play with it.