Hex #66579f or rgb(102,87,159) in RGB space is the tint of purple violet. It has hue angle of 252.50 degrees, value = 62 and saturation = 45. #66579f can be obtained by mixing 4 colors: 3 drops of red, 3 drops of magenta, 5 drops of blue, 4 drops of cyan.
Nearest safe hex - #666699. Below you can see the block with #66579f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66579f to the mixer and play with it.