545

This number is a composite.

The smallest palindrome resulting from the sum of an ascending sequence of consecutive primes with a descending sequence of the same primes as exponents (2⁷ + 3⁵ + 5³ + 7² = 545). [Gevisier]

1*1! + 2*2! + 3*3! + ... + 545*545! is a titanic prime. [Firoozbakht]

n⁶ + 545 is composite for n = 1303, ..., 10583. [Wesolowski]