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 Ottoman Empire in Turkey. The longest-lasting of the Gunpowder Empires, the Ottoman Empire in Turkey actually was first established in 1299, but it fell to the conquering armies of Timur the Lame (Tamerlane) in 1402.he third gunpowder empire, India's Mughal Empire, offers perhaps the most dramatic example of modern weaponry carrying the day. Babur, who founded the empire, was able to defeat Ibrahim Lodi of the last Delhi Sultanate at the First Battle of Panipat in 1526.