1556512056 has 144 divisors (see below), whose sum is σ = 4722452280. Its totient is φ = 462633600.

The previous prime is 1556512039. The next prime is 1556512057. The reversal of 1556512056 is 6502156551.

1556512056 is a `hidden beast` number, since 1 + 556 + 51 + 2 + 0 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1556512056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556512057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 460051 + ... + 463421.

Almost surely, 2^1556512056 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 1556512056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2361226140).

1556512056 is an abundant number, since it is smaller than the sum of its proper divisors (3165940224).

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

1556512056 is a wasteful number, since it uses less digits than its factorization.

1556512056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458 (or 3440 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 1556512056 is about 39452.6558801812. The cubic root of 1556512056 is about 1158.9129868522.

The spelling of 1556512056 in words is "one billion, five hundred fifty-six million, five hundred twelve thousand, fifty-six".