Hex #666989 or rgb(102,105,137) in RGB space is the tint of violet. It has hue angle of 234.86 degrees, value = 54 and saturation = 26. #666989 can be obtained by mixing 4 colors: 2 drops of red, 5 drops of blue, 1 drop of green, 2 drops of white.
Nearest safe hex - #666699. Below you can see the block with #666989 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666989 to the mixer and play with it.