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Which is bigger, 111711^{17} or 171117^{11}?

111711^{17} is bigger: 111711^{17} = 5.05447 × 101710^{17} and 171117^{11} = 3.42718 × 101310^{13}.

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The curve ln x / x, which decides every comparison of a^b with b^a2468101214161820-0.10.10.20.30.4x = 11x = 17peak at eln x / x
The curve ln x / x, which decides every comparison of a^b with b^a. 11^17 against 17^11 is the same question as which of the two marked points is higher; the curve peaks at x = e.

How to work it out

  1. 1

    Compute both exactly: 111711^{17} = 505447028499293771 and 171117^{11} = 34271896307633.

  2. 2

    So 111711^{17} is bigger.

  3. 3

    The reason: taking logs, aba^{b} against bab^{a} is the same as ln⁡aa\frac{\ln a}{a} against ln⁡bb\frac{\ln b}{b}. The function ln⁡xx\frac{\ln x}{x} rises until x=e≈2.718x = e \approx 2.718 and falls afterwards. Both 11 and 17 are past e, where the function is decreasing, so the larger exponent loses and 111711^{17} > 171117^{11}.

    ln⁡1111 > ln⁡1717\frac{\ln 11}{11}\ >\ \frac{\ln 17}{17}
LaTeX source of the formulas on this page
\[ 11^{17} = 5.05447\times 10^{17}\ >\ 17^{11} = 34271896307633 \]
\[ \frac{\ln 11}{11}\ >\ \frac{\ln 17}{17} \]

Questions

Which is bigger, 111711^{17} or 171117^{11}?

111711^{17} is bigger: 111711^{17} = 5.05447 × 101710^{17} and 171117^{11} = 3.42718 × 101310^{13}.

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