• 556 can be written using four 4's:
556 has 6 divisors (see below), whose sum is σ = 980. Its totient is φ = 276.
The previous prime is 547. The next prime is 557. The reversal of 556 is 655.
It is a happy number.
It is a magnanimous number.
It is a plaindrome in base 9, base 10, base 11, base 13 and base 16.
It is a nialpdrome in base 5.
It is not an unprimeable number, because it can be changed into a prime (557) by changing a digit.
556 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66 + ... + 73.
It is an amenable number.
556 is a deficient number, since it is larger than the sum of its proper divisors (424).
556 is a wasteful number, since it uses less digits than its factorization.
556 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 143 (or 141 counting only the distinct ones).
The product of its digits is 150, while the sum is 16.
The square root of 556 is about 23.5796522451. The cubic root of 556 is about 8.2228985186. Note that the first 3 decimals are identical.
Subtracting from 556 its product of digits (150), we obtain a triangular number (406 = T28).
Subtracting 556 from its reverse (655), we obtain a palindrome (99).
The spelling of 556 in words is "five hundred fifty-six", and thus it is an aban number and an oban number.
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