Hex #664766 or rgb(102,71,102) in RGB space is the tint of magenta. It has hue angle of 300.00 degrees, value = 40 and saturation = 30. #664766 can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of magenta, 2 drops of cyan, 4 drops of black.
Nearest safe hex - #663366. Below you can see the block with #664766 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664766 to the mixer and play with it.