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# How many digits of pi have been calculated?

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According to Numberworld, 12.1 trillion digits of pi have been calculated, as of December 2013. This was achieved after 94 days of computation; however, 12 of those days were lost to hardware issues. The previous calculation that achieved 10 trillion digits took 371 days to complete two years prior.

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As of 2014, the world record for digits of pi memorized is held by Chao Lu from China. He spent four years practicing and was able to recite 67,890 digits of pi from memory. The recitation happened on Nov. 20, 2005, took just over 24 hours to complete and was documented on 26 video tapes.

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## Related Questions

• A:

To write a number in scientific notation form, write the digits of the original number with a decimal point after the first digit. Then write a multiplication sign, and indicate the power of 10 necessary to put the decimal point where it needs to be to express the original number.

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Using the digits 0 to 9, with no number repeating itself, 151,200 possible combinations of six digits. However, if a true number is required, meaning 0 cannot be the first digit, only 136,080 combinations are available.

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An endless number of digits are in pi. It is an irrational number, which means it cannot be expressed as the ratio of any two integers. Furthermore, it was proved in 1882 that pi is not the root of an algebraic equation that has rational factors.

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The lowest whole number with six digits is 100,000, which is greater than 99,999, the greatest whole number with five digits. A whole number is defined as any integer that is zero or greater, meaning that it does not contain fractions.