Hex #5b8198 or rgb(91,129,152) in RGB space is the tint of blue. It has hue angle of 202.62 degrees, value = 60 and saturation = 40. #5b8198 can be obtained by mixing 4 colors: 5 drops of blue, 1 drop of green, 5 drops of white, 3 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5b8198 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b8198 to the mixer and play with it.