55561005556 has 12 divisors (see below), whose sum is σ = 111122011168. Its totient is φ = 23811859512.

The previous prime is 55561005523. The next prime is 55561005559. The reversal of 55561005556 is 65550016555.

55561005556 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561005559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992160786 + ... + 992160841.

Almost surely, 2^55561005556 is an apocalyptic number.

It is an amenable number.

55561005556 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.

55561005556 is a wasteful number, since it uses less digits than its factorization.

55561005556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984321638 (or 1984321636 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 43.

The spelling of 55561005556 in words is "fifty-five billion, five hundred sixty-one million, five thousand, five hundred fifty-six".