55981227218 has 16 divisors (see below), whose sum is σ = 95970916800. Its totient is φ = 23991179856.

The previous prime is 55981227179. The next prime is 55981227229. The reversal of 55981227218 is 81272218955.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 683108 + ... + 760656.

It is an arithmetic number, because the mean of its divisors is an integer number (5998182300).

Almost surely, 2^55981227218 is an apocalyptic number.

55981227218 is a deficient number, since it is larger than the sum of its proper divisors (39989689582).

55981227218 is a wasteful number, since it uses less digits than its factorization.

55981227218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129121.

The product of its digits is 806400, while the sum is 50.

The spelling of 55981227218 in words is "fifty-five billion, nine hundred eighty-one million, two hundred twenty-seven thousand, two hundred eighteen".