Hex #66764d or rgb(102,118,77) in RGB space is the tint of olive. It has hue angle of 83.41 degrees, value = 46 and saturation = 35. #66764d can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of green, 3 drops of white, 5 drops of black.
Nearest safe hex - #666666. Below you can see the block with #66764d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66764d to the mixer and play with it.