18551720222 has 16 divisors (see below), whose sum is σ = 32542553472. Its totient is φ = 7765836120.

The previous prime is 18551720189. The next prime is 18551720263. The reversal of 18551720222 is 22202715581.

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, 15407804 + ... + 15409007.

It is an arithmetic number, because the mean of its divisors is an integer number (2033909592).

Almost surely, 2^18551720222 is an apocalyptic number.

18551720222 is a deficient number, since it is larger than the sum of its proper divisors (13990833250).

18551720222 is a wasteful number, since it uses less digits than its factorization.

18551720222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30816863.

The product of its (nonzero) digits is 22400, while the sum is 35.

The spelling of 18551720222 in words is "eighteen billion, five hundred fifty-one million, seven hundred twenty thousand, two hundred twenty-two".