1556000556 has 48 divisors (see below), whose sum is σ = 3978253440. Its totient is φ = 469429120.

The previous prime is 1556000549. The next prime is 1556000561. The reversal of 1556000556 is 6550006551.

It is a super-2 number, since 2×1556000556² = 4842275460544618272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4000 + ... + 55928.

It is an arithmetic number, because the mean of its divisors is an integer number (82880280).

Almost surely, 2^1556000556 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 1556000556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989126720).

1556000556 is an abundant number, since it is smaller than the sum of its proper divisors (2422252884).

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

1556000556 is a wasteful number, since it uses less digits than its factorization.

1556000556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52174 (or 52172 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 1556000556 is about 39446.1728942112. The cubic root of 1556000556 is about 1158.7860258615.

The spelling of 1556000556 in words is "one billion, five hundred fifty-six million, five hundred fifty-six", and thus it is an aban number.