The mathematical constant e is one of the most important numbers in mathematics, along with the constant π(pi), and the imaginary unit i. The mathematical constant e is the unique real number such that the function e to the power of x has the same value as the slope of the tangent line, for all values of x. The number e is sometimes called Euler's number after the Swiss mathematician Leonhard Euler.
Since e is transcendental, and therefore irrational, its value cannot be given exactly as a finite or eventually repeating decimal. The numerical value of e truncated to 20 decimal places is:
2.71828 18284 59045 23536...
Bhaskar Karmakar of India created world record by reciting e to an astonishing 5,002 decimal places. He performed his world record breaking feat on 25 November 2007, taking a time of just 1 hour 29 minutes 52 seconds. He also recited the value backwards to 5002 decimal places in 1 hr 48 min 45 seconds.
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