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).
Area: about 49.7 million kmÂ² (19,189,277 sq mi) it covers about 30 percent of Earth's total land area. The area is shared by 48 countries, by far the largest country by area is Russia with more than 17 million kmÂ², second is China with 9.6 million kmÂ², smallest independent state in Asia are the Maldives with 298 kmÂ².