Hex #667e91 or rgb(102,126,145) in RGB space is the tint of blue. It has hue angle of 206.51 degrees, value = 57 and saturation = 30. #667e91 can be obtained by mixing 3 colors: 4 drops of red, 1 drop of blue, 5 drops of cyan.
Nearest safe hex - #666699. Below you can see the block with #667e91 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667e91 to the mixer and play with it.