1551561000556 has 12 divisors (see below), whose sum is σ = 3103122001168. Its totient is φ = 664954714512.

The previous prime is 1551561000511. The next prime is 1551561000607. The reversal of 1551561000556 is 6550001651551.

1551561000556 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 27706446411 + ... + 27706446466.

Almost surely, 2^{1551561000556} is an apocalyptic number.

It is an amenable number.

1551561000556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1551561000556 is a wasteful number, since it uses less digits than its factorization.

1551561000556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55412892888 (or 55412892886 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 1551561000556 in words is "one trillion, five hundred fifty-one billion, five hundred sixty-one million, five hundred fifty-six", and thus it is an aban number.