They are approximately equal to the circumference of any given circle divided by it's diameter. Approximately because an exactly equal value would require an infinite number of digits.
Those same first 2.7 trillion digits were recently computed on a desktop computer by Fabrice Bellard, a record accomplishment that would be impossible to reproduce in a wiki.
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The estimated trillion digits of pi are 27 trillion digits. An exact equal value would require an infinite number of digits and cannot be proved to any exact trillions.
There is 5 trillion digits of pi.
There is no end to the digits of pi since pi is an irrational number it goes on forever and there is no end to it, so yes, there are much more than 2.5 trillion digits of pi
Pi was calculated to 10 trillion digits on October 17, 2011.
The digits of pi are known to more than a trillion (1012) digits, but it is impossible to state all of them in this forum.