556553556 has 72 divisors (see below), whose sum is σ = 1556058504. Its totient is φ = 166613760.

The previous prime is 556553551. The next prime is 556553573. The reversal of 556553556 is 655355655.

556553556 is a `hidden beast` number, since 5 + 5 + 65 + 535 + 56 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 265168656 + 291384900 = 16284^2 + 17070^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556553551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1246 + ... + 33386.

Almost surely, 2^556553556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 556553556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778029252).

556553556 is an abundant number, since it is smaller than the sum of its proper divisors (999504948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

556553556 is a wasteful number, since it uses less digits than its factorization.

556553556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32201 (or 32196 counting only the distinct ones).

The product of its digits is 1687500, while the sum is 45.

The square root of 556553556 is about 23591.3873267343. The cubic root of 556553556 is about 822.5626531235.

The spelling of 556553556 in words is "five hundred fifty-six million, five hundred fifty-three thousand, five hundred fifty-six".