The hex color #1640d5 is a dark color. The web-safe version is Hex
#0033CC. A complementary color is
#E9BF2A. The grayscale version is
#646464. A 20% lighter version of the original color is
#4973FF, and Hex
#000DA2 is the 20% darker color. If the color is saturated by 10%, you get
#0E3CE0. If the color is desaturated by 10%, the color
#1E44CA is obtained.