55232235440 has 120 divisors (see below), whose sum is σ = 138967199280. Its totient is φ = 20343882240.

The previous prime is 55232235419. The next prime is 55232235481. The reversal of 55232235440 is 4453223255.

It is a self number, because there is not a number n which added to its sum of digits gives 55232235440.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55733345 + ... + 55734335.

It is an arithmetic number, because the mean of its divisors is an integer number (1158059994).

Almost surely, 2^55232235440 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 55232235440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69483599640).

55232235440 is an abundant number, since it is smaller than the sum of its proper divisors (83734963840).

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

55232235440 is an equidigital number, since it uses as much as digits as its factorization.

55232235440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 35.

Adding to 55232235440 its reverse (4453223255), we get a palindrome (59685458695).

The spelling of 55232235440 in words is "fifty-five billion, two hundred thirty-two million, two hundred thirty-five thousand, four hundred forty".