55533222990 has 384 divisors, whose sum is σ = 181077811200. Its totient is φ = 11522165760.

The previous prime is 55533222989. The next prime is 55533223019. The reversal of 55533222990 is 9922233555.

55533222990 is a `hidden beast` number, since 5 + 5 + 5 + 332 + 229 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 40445944 + ... + 40447316.

It is an arithmetic number, because the mean of its divisors is an integer number (471556800).

Almost surely, 2^55533222990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55533222990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90538905600).

55533222990 is an abundant number, since it is smaller than the sum of its proper divisors (125544588210).

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

55533222990 is a wasteful number, since it uses less digits than its factorization.

55533222990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552 (or 1549 counting only the distinct ones).

The product of its (nonzero) digits is 729000, while the sum is 45.

The spelling of 55533222990 in words is "fifty-five billion, five hundred thirty-three million, two hundred twenty-two thousand, nine hundred ninety".