666,666

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Number

$666 \, 666$ is:

$2 \times 3^2 \times 7 \times 11 \times 13 \times 37$

The area of the Pythagorean triangle $693-1924-2045$, the second after the Pythagorean triangle $3-4-5$ to have a repdigit area.

Also see

• Previous: Pythagorean Triangles whose Areas are Repdigit Numbers

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $666,666$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $666,666$