Psy's Gangnam Style video has been watched so many times that YouTube's counter could not cope and the company had to upgrade its system. Why did this happen?
The catchy Korean pop video catapulted the artist Psy and his signature dance moves to fame in 2012 and two years later, Gangnam Style is still the video most watched on YouTube.
At the time of writing, it has had 2,155,653,764 views - which is actually a bit of a problem, as YouTube's view counter could not count beyond 2,147,483,647.
"We never thought a video would be watched in numbers greater than a 32-bit integer (=2,147,483,647 views) but that was before we met Psy," says YouTube in a statement.
The phrase "32-bit integer" is significant because it refers to how big a number a computer's memory can store.
Computers work in binary code - a system of zeros and ones. Every number we use has to be turned into a series of binary digits or "bits" so that a computer can understand it.
It can help to think of 32 bits as a row of 32 boxes. The boxes can have either a one or a zero in them and every box corresponds to a different number, each of which is double the number for the previous box.
For example, the first box corresponds to the number one, the second to the number two, the third to the number four, the fourth to the number eight and so on.
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