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This number is a composite.
55 is 5 times the 5th prime. [Woods]
Every number greater than 55 is the sum of distinct primes of the form 4n + 3. [Wells]
If sigma(n)/n is greater than 9, then n has at least 55 distinct prime factors. [Laatsch]
Klimov (1975) showed that all integers are the sum of at most 55 prime numbers.
2^55-55 is the largest non-titanic prime of form 2^n-n, where n is a composite number. [Loungrides]
(There are 6 curios for this number that have not yet been approved by an editor.)
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