Hex #66774d or rgb(102,119,77) in RGB space is the tint of olive. It has hue angle of 84.29 degrees, value = 47 and saturation = 35. #66774d can be obtained by mixing 4 colors: 2 drops of yellow, 2 drops of red, 3 drops of cyan, 3 drops of black.
Nearest safe hex - #666666. Below you can see the block with #66774d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66774d to the mixer and play with it.