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Which is bigger, 131613^{16} or 161316^{13}?

131613^{16} is bigger: 131613^{16} = 6.65416 × 101710^{17} and 161316^{13} = 4.50359 × 101510^{15}.

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The curve ln x / x, which decides every comparison of a^b with b^a24681012141618-0.2-0.10.10.20.30.4x = 13x = 16peak at eln x / x
The curve ln x / x, which decides every comparison of a^b with b^a. 13^16 against 16^13 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: 131613^{16} = 665416609183179841 and 161316^{13} = 4503599627370496.

  2. 2

    So 131613^{16} 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 13 and 16 are past e, where the function is decreasing, so the larger exponent loses and 131613^{16} > 161316^{13}.

    ln⁡1313 > ln⁡1616\frac{\ln 13}{13}\ >\ \frac{\ln 16}{16}
LaTeX source of the formulas on this page
\[ 13^{16} = 6.65416\times 10^{17}\ >\ 16^{13} = 4.50359\times 10^{15} \]
\[ \frac{\ln 13}{13}\ >\ \frac{\ln 16}{16} \]

Questions

Which is bigger, 131613^{16} or 161316^{13}?

131613^{16} is bigger: 131613^{16} = 6.65416 × 101710^{17} and 161316^{13} = 4.50359 × 101510^{15}.

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