163 (number)
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163 is the natural number following one hundred sixty-two and preceding one hundred sixty-four.
| Template:Numbers 100-200 | |
| Ordinal | One hundred [and] sixty-three |
| Cardinal | 163rd |
| Factorization | prime number |
| Roman numeral | CLX |
| Binary | 10100011 |
| Hexadecimal | A3 |
163 is a lucky prime. Given 163, the Mertens function returns 0. Multiplied by -1, it is a Heegner number.
163 figures in an approximation of π, in which <math>\pi \approx {2^9 \over 163}<math>. Also, it appears in the Ramanujan constant, in which <math>e^{\pi \sqrt{163}}<math> almost equals the integer 262537412640768744. Martin Gardner famously asserted that this identity was exact in a 1975 April Fools' hoax in Scientific American; in fact the value is 262537412640768743.99999999999925007259...
163 is a strictly non-palindromic number, it is not palindromic in any base from base 2 to base 161.
One hundred sixty-three is also:
ko:163