The maximum length of the number of a credit card can be 19 digits, and the length of the account field can maximum be 12 digits. Each issuer can have a trillion possible numbers of an account. The final digit on a credit card number is a check one, similar to a checksum. It confirms the initial digits of the number and prevents the attempts to invent card numbers.
Longest lasting empire in history. The Roman Empire is considered to have been the most enduring in history. The formal start date of the empire remains the subject of debate, but most historians agree that the clock began ticking in 27 BC, when the Roman politician Octavian overthrew the Roman Republic to become Emperor Augustus.
The Zhou Dynasty (1046-256 BCE) was the longest-lasting of Chinaâs dynasties. It followed the Shang Dynasty (c. 1600-1046 BCE) and it finished when the army of the state of Qin captured the city of Chengzhou in 256 BCE.