55105072220 has 72 divisors (see below), whose sum is σ = 127253548800. Its totient is φ = 20029313920.

The previous prime is 55105072193. The next prime is 55105072241. The reversal of 55105072220 is 2227050155.

It is a congruent number.

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, 8198021 + ... + 8204739.

It is an arithmetic number, because the mean of its divisors is an integer number (1767410400).

Almost surely, 2^55105072220 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 55105072220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63626774400).

55105072220 is an abundant number, since it is smaller than the sum of its proper divisors (72148476580).

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

55105072220 is a wasteful number, since it uses less digits than its factorization.

55105072220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10139 (or 10126 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 29.

The spelling of 55105072220 in words is "fifty-five billion, one hundred five million, seventy-two thousand, two hundred twenty".