Hex #669bd8 or rgb(102,155,216) in RGB space is the tint of blue. It has hue angle of 212.11 degrees, value = 85 and saturation = 53. #669bd8 can be obtained by mixing 4 colors: 2 drops of magenta, 5 drops of blue, 4 drops of cyan, 4 drops of white.
Nearest safe hex - #6699cc. Below you can see the block with #669bd8 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #669bd8 to the mixer and play with it.