18001316503 has 2 divisors, whose sum is σ = 18001316504. Its totient is φ = 18001316502.

The previous prime is 18001316497. The next prime is 18001316533. The reversal of 18001316503 is 30561310081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18001316503 - 2³³ = 9411381911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18001316533) 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 as a sum of consecutive naturals, namely, 9000658251 + 9000658252.

It is an arithmetic number, because the mean of its divisors is an integer number (9000658252).

Almost surely, 2^18001316503 is an apocalyptic number.

18001316503 is a deficient number, since it is larger than the sum of its proper divisors (1).

18001316503 is an equidigital number, since it uses as much as digits as its factorization.

18001316503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 18001316503 its reverse (30561310081), we get a palindrome (48562626584).

The spelling of 18001316503 in words is "eighteen billion, one million, three hundred sixteen thousand, five hundred three".