Hex #668399 or rgb(102,131,153) in RGB space is the tint of blue. It has hue angle of 205.88 degrees, value = 60 and saturation = 33. #668399 can be obtained by mixing 4 colors: 1 drop of red, 3 drops of magenta, 4 drops of cyan, 2 drops of green.
Nearest safe hex - #669999. Below you can see the block with #668399 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668399 to the mixer and play with it.