Following the third, fourth, or fifth digit, every number up through 15 is the account number while that final number, 16, is the check digit. All Discover cards start with the number six and are 16 digits in length, while petroleum cards start with the number seven and airline cards start with the number one.
Vatican City. Vatican City â 0.2 square miles â The worldâs smallest state, the Vatican has a population of 770, none of whom are permanent residents. The tiny country which surrounds St. Peterâs Basilica is the spiritual center for the worldâs Roman Catholics (over 1 billion strong).
Least Populous Countries. The least populous country in Asia is Maldives, with an estimated population of 331,000. Maldives is also one of the smallest countries on earth with just 298 square kilometers (115 square miles) of area, 99% of which is water.here are a total of 51 countries in Asia. In 2013, the population of Asia is estimated at 4.299 billion. Russia is excluded from Asia's population, although there are about 40 million Russia ns who live in Asia, or east of the Ural Mountains.