55228448665840 has 80 divisors (see below), whose sum is σ = 129261823026336. Its totient is φ = 21944442240000.

The previous prime is 55228448665823. The next prime is 55228448665867. The reversal of 55228448665840 is 4856684482255.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10626090 + ... + 14945590.

Almost surely, 2^{55228448665840} 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 55228448665840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64630911513168).

55228448665840 is an abundant number, since it is smaller than the sum of its proper divisors (74033374360496).

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

55228448665840 is a wasteful number, since it uses less digits than its factorization.

55228448665840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320578 (or 4320572 counting only the distinct ones).

The product of its (nonzero) digits is 589824000, while the sum is 67.

The spelling of 55228448665840 in words is "fifty-five trillion, two hundred twenty-eight billion, four hundred forty-eight million, six hundred sixty-five thousand, eight hundred forty".