Hex #664683 or rgb(102,70,131) in RGB space is the tint of purple. It has hue angle of 271.48 degrees, value = 51 and saturation = 47. #664683 can be obtained by mixing 4 colors: 3 drops of magenta, 4 drops of blue, 3 drops of white, 5 drops of black.
Nearest safe hex - #663399. Below you can see the block with #664683 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664683 to the mixer and play with it.