Hex #666b91 or rgb(102,107,145) in RGB space is the tint of violet. It has hue angle of 233.02 degrees, value = 57 and saturation = 30. #666b91 can be obtained by mixing 4 colors: 4 drops of magenta, 3 drops of cyan, 2 drops of green, 1 drop of black.
Nearest safe hex - #666699. Below you can see the block with #666b91 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666b91 to the mixer and play with it.