218522222166 has 16 divisors (see below), whose sum is σ = 437245041600. Its totient is φ = 72807307848.

The previous prime is 218522222159. The next prime is 218522222179. The reversal of 218522222166 is 661222225812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8344056 + ... + 8370203.

It is an arithmetic number, because the mean of its divisors is an integer number (27327815100).

Almost surely, 2^218522222166 is an apocalyptic number.

218522222166 is an abundant number, since it is smaller than the sum of its proper divisors (218722819434).

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

218522222166 is a wasteful number, since it uses less digits than its factorization.

218522222166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16716443.

The product of its digits is 92160, while the sum is 39.

Adding to 218522222166 its reverse (661222225812), we get a palindrome (879744447978).

The spelling of 218522222166 in words is "two hundred eighteen billion, five hundred twenty-two million, two hundred twenty-two thousand, one hundred sixty-six".