Hecho matemático: 669 is the number of unsymmetrical ways to dissect a regular 12-gon into 10 triangles.
Trivia: 669 is an uninteresting number.
Fecha histórica: October 30th is the day in 1947 that the General Agreement on Tariffs and Trade (GATT), which is the foundation of the World Trade Organisation (WTO), is founded.