Hex #66775b or rgb(102,119,91) in RGB space is the tint of olive. It has hue angle of 96.43 degrees, value = 47 and saturation = 24. #66775b can be obtained by mixing 4 colors: 3 drops of yellow, 3 drops of magenta, 5 drops of blue, 4 drops of green.
Nearest safe hex - #666666. Below you can see the block with #66775b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66775b to the mixer and play with it.