18222868393 has 4 divisors (see below), whose sum is σ = 18232599508. Its totient is φ = 18213137280.

The previous prime is 18222868387. The next prime is 18222868493. The reversal of 18222868393 is 39386822281.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1778140224 + 16444728169 = 42168^2 + 128237^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18222868393 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 18222868393.

It is not an unprimeable number, because it can be changed into a prime (18222868333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4862748 + ... + 4866493.

It is an arithmetic number, because the mean of its divisors is an integer number (4558149877).

Almost surely, 2^18222868393 is an apocalyptic number.

It is an amenable number.

18222868393 is a deficient number, since it is larger than the sum of its proper divisors (9731115).

18222868393 is an equidigital number, since it uses as much as digits as its factorization.

18222868393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9731114.

The product of its digits is 1990656, while the sum is 52.

The spelling of 18222868393 in words is "eighteen billion, two hundred twenty-two million, eight hundred sixty-eight thousand, three hundred ninety-three".