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A Japanese psychiatrist memorized 83,431 digits of pi. This man is Akira Haraguchi.
So far it's been calculated to well over a trillion decimal places ! The final answer will never be known - since the value of Pi is a never-ending number that (up to now) doesn't exhibit any repetitive sequence of digits. Theoretically, someone could calculate the number for the rest of their lives and never reach a final solution !
To assess the number of significant digits in a number, you first have to find the greatest non-zero digit. In this case it is the first five which represent 500. The next step is to simply count how many digits there are after this number. In this case, there are 4 more digits. Thus the number 500.95 has been given to 5 significant digits.
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1.2411 trillion digits (1,241,100,000,000) digits of pi have been dicovered. * * * * * 1.2 trillion? That is ancient history! Pi is a transcendental number and so its decimal representation has infinitely many digits. Ten trillion digits in its decimal form were calculated in October 2011. See link for details.