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Which is bigger, 565^{6} or 656^{5}?

565^{6} is bigger: 565^{6} = 15625 and 656^{5} = 7776.

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The curve ln x / x, which decides every comparison of a^b with b^a123456789-1.2-1-0.8-0.6-0.4-0.20.20.4x = 5x = 6peak at eln x / x
The curve ln x / x, which decides every comparison of a^b with b^a. 5^6 against 6^5 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: 565^{6} = 15625 and 656^{5} = 7776.

  2. 2

    So 565^{6} 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 5 and 6 are past e, where the function is decreasing, so the larger exponent loses and 565^{6} > 656^{5}.

    ln⁡55 > ln⁡66\frac{\ln 5}{5}\ >\ \frac{\ln 6}{6}
LaTeX source of the formulas on this page
\[ 5^{6} = 15625\ >\ 6^{5} = 7776 \]
\[ \frac{\ln 5}{5}\ >\ \frac{\ln 6}{6} \]

Questions

Which is bigger, 565^{6} or 656^{5}?

565^{6} is bigger: 565^{6} = 15625 and 656^{5} = 7776.

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