5525

Number
$5525$ (five thousand, five hundred and twenty-five) is:


 * $5^2 \times 13 \times 17$


 * The $25$th square pyramidal number after $1$, $5$, $14$, $30$, $55$, $\ldots$, $1015$, $1240$, $1496$, $1785$, $2109$, $2470$, $2870$, $3311$, $3795$, $4324$, $4900$:
 * $5525 = \displaystyle \sum_{k \mathop = 1}^{25} k^2 = \dfrac {25 \left({25 + 1}\right) \left({2 \times 25 + 1}\right)} 6$