55885213440 has 864 divisors, whose sum is σ = 234908089920. Its totient is φ = 12541132800.

The previous prime is 55885213409. The next prime is 55885213441. The reversal of 55885213440 is 4431258855.

55885213440 is a `hidden beast` number, since 5 + 5 + 88 + 521 + 3 + 4 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55885213441) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 103299570 + ... + 103300110.

Almost surely, 2^55885213440 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 55885213440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117454044960).

55885213440 is an abundant number, since it is smaller than the sum of its proper divisors (179022876480).

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

55885213440 is a wasteful number, since it uses less digits than its factorization.

55885213440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 45.

The spelling of 55885213440 in words is "fifty-five billion, eight hundred eighty-five million, two hundred thirteen thousand, four hundred forty".