Hex #557b26 or rgb(85,123,38) in RGB space is the tint of olive. It has hue angle of 86.82 degrees, value = 48 and saturation = 69. #557b26 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of red, 2 drops of blue, 4 drops of green.
Nearest safe hex - #666633. Below you can see the block with #557b26 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557b26 to the mixer and play with it.