Hex #668fb3 or rgb(102,143,179) in RGB space is the tint of blue. It has hue angle of 208.05 degrees, value = 70 and saturation = 43. #668fb3 can be obtained by mixing 4 colors: 2 drops of red, 3 drops of blue, 3 drops of cyan, 2 drops of white.
Nearest safe hex - #6699cc. Below you can see the block with #668fb3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668fb3 to the mixer and play with it.