Hex #6688a2 or rgb(102,136,162) in RGB space is the tint of blue. It has hue angle of 206.00 degrees, value = 64 and saturation = 37. #6688a2 can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of blue, 3 drops of white, 1 drop of black.
Nearest safe hex - #669999. Below you can see the block with #6688a2 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #6688a2 to the mixer and play with it.