$3599=59*61$

$\phi(n)=(59-1)*(61-1)=3480$

$d*e\equiv (1)mod(3480)$

After solving a lot

$d = 3031$

$\phi(n)=(59-1)*(61-1)=3480$

$d*e\equiv (1)mod(3480)$

After solving a lot

$d = 3031$

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