55118218 has 4 divisors (see below), whose sum is σ = 82677330. Its totient is φ = 27559108.

The previous prime is 55118209. The next prime is 55118249. The reversal of 55118218 is 81281155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54952569 + 165649 = 7413^2 + 407^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55118218.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13779553 + ... + 13779556.

Almost surely, 2^55118218 is an apocalyptic number.

55118218 is a deficient number, since it is larger than the sum of its proper divisors (27559112).

55118218 is a wasteful number, since it uses less digits than its factorization.

55118218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27559111.

The product of its digits is 3200, while the sum is 31.

The square root of 55118218 is about 7424.1644647731. The cubic root of 55118218 is about 380.5675222629.

It can be divided in two parts, 551 and 18218, that added together give a square (18769 = 137²).

The spelling of 55118218 in words is "fifty-five million, one hundred eighteen thousand, two hundred eighteen".