245

Number
$245$ (two hundred and forty-five) is:


 * $5 \times 7^2$


 * The $4$th of the $1$st quadruple of consecutive integers which all have an equal divisors:
 * $\tau \left({242}\right) = \tau \left({243}\right) = \tau \left({244}\right) = \tau \left({245}\right) = 6$


 * The largest odd positive integer that cannot be expressed as the sum of exactly $5$ non-zero square numbers all of which are coprime.

Also see

 * Odd Numbers Not Expressible as Sum of 5 Distinct Non-Zero Coprime Squares