Hex #66745b or rgb(102,116,91) in RGB space is the tint of olive. It has hue angle of 93.60 degrees, value = 45 and saturation = 22. #66745b can be obtained by mixing 4 colors: 2 drops of magenta, 4 drops of green, 4 drops of white, 5 drops of black.
Nearest safe hex - #666666. Below you can see the block with #66745b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66745b to the mixer and play with it.