6,661,661,161

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Number

$6 \, 661 \, 661 \, 161$ is:

$81 \, 619^2$

The $24$th (and largest known) square after $1$, $4$, $9$, $16$, $25$, $\ldots$, $11 \, 881$, $29 \, 929$, $44 \, 944$, $55 \, 225$, $69 \, 696$, $9 \, 696 \, 996$ which has no more than $2$ distinct digits and does not end in $0$:

$6 \, 661 \, 661 \, 161 = 81 \, 619^2$

The $81 \, 619$th square number:

$6 \, 661 \, 661 \, 161 = 81 \, 619 \times 81 \, 619$

Also see

• Previous: Squares with No More than 2 Distinct Digits
• Previous  ... Next: Square Number

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $6,661,661,161$