218522518 has 12 divisors (see below), whose sum is σ = 336886452. Its totient is φ = 106306920.

The previous prime is 218522459. The next prime is 218522537. The reversal of 218522518 is 815225812.

It is a happy number.

218522518 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 37168 + ... + 42643.

It is an arithmetic number, because the mean of its divisors is an integer number (28073871).

Almost surely, 2^218522518 is an apocalyptic number.

218522518 is a deficient number, since it is larger than the sum of its proper divisors (118363934).

218522518 is an equidigital number, since it uses as much as digits as its factorization.

218522518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79887 (or 79850 counting only the distinct ones).

The product of its digits is 12800, while the sum is 34.

The square root of 218522518 is about 14782.5071621833. The cubic root of 218522518 is about 602.3266311325.

The spelling of 218522518 in words is "two hundred eighteen million, five hundred twenty-two thousand, five hundred eighteen".