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This number is a prime.
Ronald Reagan lived at 1669 San Onofre Drive in Pacific Palisades, California, just before he was inaugurated as U.S. President in 1981. [NYULR93] [NYU Law Review]
The Old Believers in Russia believed that the end of the world would occur in 1669. [Robinson]
1669^2 = 2785561, and 278 * (5/5) * 6 + 1 = 1669. [Meller]
The smallest prime that appears in the same position of its own value when the Roman numerals (from 1 to 3999) are placed in lexicographic order. The other primes with this property are 3623 and 3631. [Meller]
The smallest and only known invertible prime (emirp) that can be represented as sum of two successive Lychrel numbers, i.e., 790 + 879. [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
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