55163218 has 16 divisors (see below), whose sum is σ = 90383040. Its totient is φ = 25042000.

The previous prime is 55163201. The next prime is 55163219. The reversal of 55163218 is 81236155.

55163218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 55163218.

It is not an unprimeable number, because it can be changed into a prime (55163219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28068 + ... + 29968.

It is an arithmetic number, because the mean of its divisors is an integer number (5648940).

Almost surely, 2^55163218 is an apocalyptic number.

55163218 is a deficient number, since it is larger than the sum of its proper divisors (35219822).

55163218 is a wasteful number, since it uses less digits than its factorization.

55163218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233.

The product of its digits is 7200, while the sum is 31.

The square root of 55163218 is about 7427.1944905193. The cubic root of 55163218 is about 380.6710626206.

The spelling of 55163218 in words is "fifty-five million, one hundred sixty-three thousand, two hundred eighteen".