18717317201903 has 2 divisors, whose sum is σ = 18717317201904. Its totient is φ = 18717317201902.

The previous prime is 18717317201743. The next prime is 18717317201923. The reversal of 18717317201903 is 30910271371781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18717317201903 - 2⁸ = 18717317201647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18717317201923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9358658600951 + 9358658600952.

It is an arithmetic number, because the mean of its divisors is an integer number (9358658600952).

Almost surely, 2^{18717317201903} is an apocalyptic number.

18717317201903 is a deficient number, since it is larger than the sum of its proper divisors (1).

18717317201903 is an equidigital number, since it uses as much as digits as its factorization.

18717317201903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 444528, while the sum is 50.

The spelling of 18717317201903 in words is "eighteen trillion, seven hundred seventeen billion, three hundred seventeen million, two hundred one thousand, nine hundred three".