55388884864 has 64 divisors (see below), whose sum is σ = 113004380160. Its totient is φ = 27030265344.

The previous prime is 55388884861. The next prime is 55388884891. The reversal of 55388884864 is 46848888355.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 55388884864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55388884861) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2195329 + ... + 2220415.

It is an arithmetic number, because the mean of its divisors is an integer number (1765693440).

Almost surely, 2^55388884864 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 55388884864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56502190080).

55388884864 is an abundant number, since it is smaller than the sum of its proper divisors (57615495296).

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

55388884864 is a wasteful number, since it uses less digits than its factorization.

55388884864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25515 (or 25503 counting only the distinct ones).

The product of its digits is 235929600, while the sum is 67.

The spelling of 55388884864 in words is "fifty-five billion, three hundred eighty-eight million, eight hundred eighty-four thousand, eight hundred sixty-four".