55423445440 has 112 divisors (see below), whose sum is σ = 145947932640. Its totient is φ = 19877806080.

The previous prime is 55423445411. The next prime is 55423445443. The reversal of 55423445440 is 4454432455.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 55423445393 and 55423445402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55423445443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149116 + ... + 364804.

Almost surely, 2^55423445440 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 55423445440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72973966320).

55423445440 is an abundant number, since it is smaller than the sum of its proper divisors (90524487200).

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

55423445440 is a wasteful number, since it uses less digits than its factorization.

55423445440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215790 (or 215780 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 40.

Adding to 55423445440 its reverse (4454432455), we get a palindrome (59877877895).

The spelling of 55423445440 in words is "fifty-five billion, four hundred twenty-three million, four hundred forty-five thousand, four hundred forty".