556

556 = 2 x 2 x 139.

556 is the total number of parts in all partitions of 13.

556 are the first three digits of 4⁵⁵⁶.

556 is the sum of four consecutive primes: 556 = 131 + 137 + 139 + 149.

556 is an untouchable number; it is never the sum of the proper divisors of any integer.

556 Phyllis is an asteroid orbiting the sun, discovered in 1905.

U-556 was a German submarine that was built for and operated during World War II.

Source: What's Special About This Number?