55621633228 has 60 divisors (see below), whose sum is σ = 113903650952. Its totient is φ = 23764466880.

The previous prime is 55621633187. The next prime is 55621633229. The reversal of 55621633228 is 82233612655.

It is not an unprimeable number, because it can be changed into a prime (55621633229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3170176 + ... + 3187672.

Almost surely, 2^55621633228 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 55621633228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56951825476).

55621633228 is an abundant number, since it is smaller than the sum of its proper divisors (58282017724).

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

55621633228 is a wasteful number, since it uses less digits than its factorization.

55621633228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17860 (or 17837 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The spelling of 55621633228 in words is "fifty-five billion, six hundred twenty-one million, six hundred thirty-three thousand, two hundred twenty-eight".