Hex #667d91 or rgb(102,125,145) in RGB space is the tint of blue. It has hue angle of 207.91 degrees, value = 57 and saturation = 30. #667d91 can be obtained by mixing 3 colors: 4 drops of magenta, 3 drops of cyan, 3 drops of green.
Nearest safe hex - #666699. Below you can see the block with #667d91 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667d91 to the mixer and play with it.