What is a very lucky number?

The number 7 is considered a very lucky number in many cultures. In ancient Egypt, it was believed to be the number of perfection and eternity, and was associated with the gods. In ancient Greece and Rome, it was believed to be the number of luck and fortune. In Christianity, it is the number of the seven deadly sins, the seven virtues, and the seven days of creation. In many Asian cultures, it is considered the luckiest number, and is often associated with good luck, prosperity, and happiness.