Hex #668733 or rgb(102,135,51) in RGB space is the tint of olive. It has hue angle of 83.57 degrees, value = 53 and saturation = 62. #668733 can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of green, 1 drop of white, 2 drops of black.
Nearest safe hex - #669933. Below you can see the block with #668733 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668733 to the mixer and play with it.