18520706903 has 2 divisors, whose sum is σ = 18520706904. Its totient is φ = 18520706902.

The previous prime is 18520706891. The next prime is 18520706923. The reversal of 18520706903 is 30960702581.

It is a weak prime.

It is an emirp because it is prime and its reverse (30960702581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18520706903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18520706923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9260353451 + 9260353452.

It is an arithmetic number, because the mean of its divisors is an integer number (9260353452).

Almost surely, 2^18520706903 is an apocalyptic number.

18520706903 is a deficient number, since it is larger than the sum of its proper divisors (1).

18520706903 is an equidigital number, since it uses as much as digits as its factorization.

18520706903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 18520706903 in words is "eighteen billion, five hundred twenty million, seven hundred six thousand, nine hundred three".