112,359,550,561,797,752,809

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Number

$112 \, 359 \, 550 \, 561 \, 797 \, 752 \, 809$ is:

$101 \times 1 \, 052 \, 788 \, 969 \times 1 \, 056 \, 689 \, 261$

The smallest positive integer which is multiplied by $99$ when $1$ is appended to each end.

Also see

• Smallest Number which is Multiplied by 99 by Appending 1 to Each End

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $112,359,550,561,797,732,809$

but note the transcription error in the $5$th digit from the end: it should be $5$ not $3$.