6999

Number
$6999$ (six thousand, nine hundred and ninety-nine) is:


 * $3 \times 2333$


 * The $1$st of the $4$-digit integers $m$ which need the largest number of reverse-and-add process iterations ($20$) before reaching a palindromic number:
 * $6999$, $16995$, $76956$, $\ldots$, $16668488486661$