396

This number is a composite.

Four consecutive primes in arithmetic progression of titanic size: 2³³³² + 445241605, 2³³³² + 445241605 + 396, 2³³³² + 445241605 + 396 + 396, 2³³³² + 445241605 + 396 + 396 + 396. Proven with Titanix by J. Fougeron.

(There is one curio for this number that has not yet been approved by an editor.)