55561011584 has 128 divisors (see below), whose sum is σ = 123207497280. Its totient is φ = 24793251840.

The previous prime is 55561011551. The next prime is 55561011587. The reversal of 55561011584 is 48511016555.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561011587) 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 15 ways as a sum of consecutive naturals, for example, 7705709 + ... + 7712915.

Almost surely, 2^55561011584 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 55561011584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61603748640).

55561011584 is an abundant number, since it is smaller than the sum of its proper divisors (67646485696).

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

55561011584 is a wasteful number, since it uses less digits than its factorization.

55561011584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7388 (or 7376 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 41.

The spelling of 55561011584 in words is "fifty-five billion, five hundred sixty-one million, eleven thousand, five hundred eighty-four".