I would not say that the number 666 is unlucky, but many people shun that number as it is the number of the Antichrist (Revelation 13:11-18.)
A lot of numbers can be unlucky, depending on which period of time you are asking about, or what background you have. The most common unlucky numbers are 13, 666 (the number of Satan) and 4 - in Greek Mythology, the lucky number was 3 so 4 was an unlucky number.
No, there is no such thing as a lucky or unlucky number: there is only superstition.
The most obvious would be 666, the fabled "mark of the Beast" found referenced in the Christian Bible in the book of Revelation
Generally speaking, a moral reform is simply a shift in a society's ideas of what is acceptable or not.
666 666 666 666 666 666 666
666 + 666 = 1332
The combination of the mysterious suitcase is "666", the "number of the beast.
47% of 666 = 47% * 666 = 0.47 * 666 = 313.02
35% of 666 = 35% * 666 = 0.35 * 666 = 233.1
15% of 666 = 15% * 666 = 0.15 * 666 = 99.9
1. Bad luck to walk under a ladder 2. 666 is the devils number 3. Friday 13th is unlucky 4. If you break a mirror, you get 7 years bad luck
666 - 666 = 0