18980003909 has 2 divisors, whose sum is σ = 18980003910. Its totient is φ = 18980003908.

The previous prime is 18980003863. The next prime is 18980003953. The reversal of 18980003909 is 90930008981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11498272900 + 7481731009 = 107230^2 + 86497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18980003909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18980003969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9490001954 + 9490001955.

It is an arithmetic number, because the mean of its divisors is an integer number (9490001955).

Almost surely, 2^18980003909 is an apocalyptic number.

It is an amenable number.

18980003909 is a deficient number, since it is larger than the sum of its proper divisors (1).

18980003909 is an equidigital number, since it uses as much as digits as its factorization.

18980003909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 47.

The spelling of 18980003909 in words is "eighteen billion, nine hundred eighty million, three thousand, nine hundred nine".