55540022220 has 192 divisors, whose sum is σ = 184517222400. Its totient is φ = 13838549760.

The previous prime is 55540022207. The next prime is 55540022221. The reversal of 55540022220 is 2222004555.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (55540022221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 428257 + ... + 542663.

It is an arithmetic number, because the mean of its divisors is an integer number (961027200).

Almost surely, 2^55540022220 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 55540022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92258611200).

55540022220 is an abundant number, since it is smaller than the sum of its proper divisors (128977200180).

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

55540022220 is a wasteful number, since it uses less digits than its factorization.

55540022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114485 (or 114477 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

Adding to 55540022220 its reverse (2222004555), we get a palindrome (57762026775).

The spelling of 55540022220 in words is "fifty-five billion, five hundred forty million, twenty-two thousand, two hundred twenty".