Hex #666288 or rgb(102,98,136) in RGB space is the tint of violet. It has hue angle of 246.32 degrees, value = 53 and saturation = 28. #666288 can be obtained by mixing 4 colors: 1 drop of magenta, 1 drop of cyan, 1 drop of white, 2 drops of black.
Nearest safe hex - #666699. Below you can see the block with #666288 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666288 to the mixer and play with it.