Hex #664791 or rgb(102,71,145) in RGB space is the tint of purple. It has hue angle of 265.14 degrees, value = 57 and saturation = 51. #664791 can be obtained by mixing 3 colors: 4 drops of magenta, 3 drops of cyan, 3 drops of black.
Nearest safe hex - #663399. Below you can see the block with #664791 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664791 to the mixer and play with it.