18220166393 has 16 divisors (see below), whose sum is σ = 22096015872. Its totient is φ = 14796432000.

The previous prime is 18220166389. The next prime is 18220166401. The reversal of 18220166393 is 39366102281.

It is a cyclic number.

It is not a de Polignac number, because 18220166393 - 2² = 18220166389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18220166393.

It is not an unprimeable number, because it can be changed into a prime (18220166323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2050628 + ... + 2059493.

It is an arithmetic number, because the mean of its divisors is an integer number (1381000992).

Almost surely, 2^18220166393 is an apocalyptic number.

18220166393 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18220166393 is a deficient number, since it is larger than the sum of its proper divisors (3875849479).

18220166393 is a wasteful number, since it uses less digits than its factorization.

18220166393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110176.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 18220166393 in words is "eighteen billion, two hundred twenty million, one hundred sixty-six thousand, three hundred ninety-three".