As many as you like; pi is an irrational number. That means that there are no two whole numbers that you can make into a fraction exactly equal to pi. It also means that if you start to calculate pi as a decimal it never ends and never recurrs. It just goes on forever.
A few years ago two Japanese people calculated pi to eight million places of decimals, which they then published in a book. It just never ends.
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Update: in October 2011, pi to 10 trillion (and 50) digits was published. See link.
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Oh honey, I don't have time to recite pi to 100 quadrillion digits for you. Just know that pi is an irrational number that goes on forever without repeating. So, if you need that many digits of pi, I suggest you grab a calculator and have fun with it!
It is an irrational number that has infinite digits.
pi = 3.141592..... ( recurs to infinity). 'pi' is an IRRATIONAL number, which means it CANNOT be converted to a RATIO(Fraction). Casually, irrational numbers are those where the decimals recur to infinity AND there is no regular order in the decimal digits. Compare pi = 3.141592.... IRRATIONAL (Irregular order of decimal digits) but 1/3 = 0.3333.... RATIONAL (Regular order of decimal digits). NB When given pi = 3.14 , 3.1416 , 22/7 , these are only APPROXIMATIONS and NOT equalities.
0 (Zero, Nil, Nought)
No. 81 is a rational number. An irrational number is a number with an endless amount of digits like pi or the square root of 2.