6555
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Number
$6555$ (six thousand, five hundred and fifty-five) is:
- $3 \times 5 \times 19 \times 23$
- The $114$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $5253$, $5356$, $5460$, $5565$, $5671$, $5778$, $5886$, $5995$, $6105$, $6216$, $6328$, $6441$:
- $6555 = \ds \sum_{k \mathop = 1}^{114} k = \dfrac {114 \times \paren {114 + 1} } 2$