Hex #40516b or rgb(64,81,107) in RGB space is the tint of blue. It has hue angle of 216.28 degrees, value = 42 and saturation = 40. #40516b can be obtained by mixing 4 colors: 1 drop of red, 1 drop of magenta, 4 drops of blue, 2 drops of green.
Nearest safe hex - #336666. Below you can see the block with #40516b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #40516b to the mixer and play with it.