Hex #664867 or rgb(102,72,103) in RGB space is the tint of magenta. It has hue angle of 298.06 degrees, value = 40 and saturation = 30. #664867 can be obtained by mixing 4 colors: 2 drops of red, 4 drops of magenta, 5 drops of blue, 4 drops of green.
Nearest safe hex - #663366. Below you can see the block with #664867 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664867 to the mixer and play with it.