18679938503 has 2 divisors, whose sum is σ = 18679938504. Its totient is φ = 18679938502.

The previous prime is 18679938481. The next prime is 18679938647. The reversal of 18679938503 is 30583997681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18679938503 - 2⁸ = 18679938247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18679938703) 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 as a sum of consecutive naturals, namely, 9339969251 + 9339969252.

It is an arithmetic number, because the mean of its divisors is an integer number (9339969252).

Almost surely, 2^18679938503 is an apocalyptic number.

18679938503 is a deficient number, since it is larger than the sum of its proper divisors (1).

18679938503 is an equidigital number, since it uses as much as digits as its factorization.

18679938503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 18679938503 in words is "eighteen billion, six hundred seventy-nine million, nine hundred thirty-eight thousand, five hundred three".