18975217903 has 2 divisors, whose sum is σ = 18975217904. Its totient is φ = 18975217902.

The previous prime is 18975217883. The next prime is 18975217949. The reversal of 18975217903 is 30971257981.

It is a weak prime.

It is an emirp because it is prime and its reverse (30971257981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18975217903 - 2⁵ = 18975217871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18975217003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9487608951 + 9487608952.

It is an arithmetic number, because the mean of its divisors is an integer number (9487608952).

Almost surely, 2^18975217903 is an apocalyptic number.

18975217903 is a deficient number, since it is larger than the sum of its proper divisors (1).

18975217903 is an equidigital number, since it uses as much as digits as its factorization.

18975217903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 18975217903 in words is "eighteen billion, nine hundred seventy-five million, two hundred seventeen thousand, nine hundred three".