Hex #66688e or rgb(102,104,142) in RGB space is the tint of violet. It has hue angle of 237.00 degrees, value = 56 and saturation = 28. #66688e can be obtained by mixing 4 colors: 1 drop of magenta, 4 drops of blue, 5 drops of white, 5 drops of black.
Nearest safe hex - #666699. Below you can see the block with #66688e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66688e to the mixer and play with it.