55306512220 has 12 divisors (see below), whose sum is σ = 116143675704. Its totient is φ = 22122604880.

The previous prime is 55306512211. The next prime is 55306512227. The reversal of 55306512220 is 2221560355.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55306512227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1382662786 + ... + 1382662825.

It is an arithmetic number, because the mean of its divisors is an integer number (9678639642).

Almost surely, 2^55306512220 is an apocalyptic number.

It is an amenable number.

55306512220 is an abundant number, since it is smaller than the sum of its proper divisors (60837163484).

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

55306512220 is a wasteful number, since it uses less digits than its factorization.

55306512220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765325620 (or 2765325618 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 55306512220 in words is "fifty-five billion, three hundred six million, five hundred twelve thousand, two hundred twenty".