18556322803 has 2 divisors, whose sum is σ = 18556322804. Its totient is φ = 18556322802.

The previous prime is 18556322779. The next prime is 18556322833. The reversal of 18556322803 is 30822365581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18556322803 - 2¹³ = 18556314611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18556322803.

It is not a weakly prime, because it can be changed into another prime (18556322833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9278161401 + 9278161402.

It is an arithmetic number, because the mean of its divisors is an integer number (9278161402).

Almost surely, 2^18556322803 is an apocalyptic number.

18556322803 is a deficient number, since it is larger than the sum of its proper divisors (1).

18556322803 is an equidigital number, since it uses as much as digits as its factorization.

18556322803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 18556322803 in words is "eighteen billion, five hundred fifty-six million, three hundred twenty-two thousand, eight hundred three".