Hex #667791 or rgb(102,119,145) in RGB space is the tint of blue. It has hue angle of 216.28 degrees, value = 57 and saturation = 30. #667791 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of magenta, 5 drops of cyan, 1 drop of black.
Nearest safe hex - #666699. Below you can see the block with #667791 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667791 to the mixer and play with it.