Hex #669bc1 or rgb(102,155,193) in RGB space is the tint of blue. It has hue angle of 205.05 degrees, value = 76 and saturation = 47. #669bc1 can be obtained by mixing 4 colors: 2 drops of red, 5 drops of blue, 4 drops of cyan, 4 drops of white.
Nearest safe hex - #6699cc. Below you can see the block with #669bc1 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #669bc1 to the mixer and play with it.