Hex #6645ab or rgb(102,69,171) in RGB space is the tint of purple violet. It has hue angle of 259.41 degrees, value = 67 and saturation = 60. #6645ab can be obtained by mixing 4 colors: 4 drops of magenta, 3 drops of blue, 2 drops of cyan, 1 drop of black.
Nearest safe hex - #663399. Below you can see the block with #6645ab color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #6645ab to the mixer and play with it.