18741609989 has 2 divisors, whose sum is σ = 18741609990. Its totient is φ = 18741609988.

The previous prime is 18741609979. The next prime is 18741610009. The reversal of 18741609989 is 98990614781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13846228900 + 4895381089 = 117670^2 + 69967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18741609989 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 (18741609949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9370804994 + 9370804995.

It is an arithmetic number, because the mean of its divisors is an integer number (9370804995).

Almost surely, 2^18741609989 is an apocalyptic number.

It is an amenable number.

18741609989 is a deficient number, since it is larger than the sum of its proper divisors (1).

18741609989 is an equidigital number, since it uses as much as digits as its factorization.

18741609989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 62.

The spelling of 18741609989 in words is "eighteen billion, seven hundred forty-one million, six hundred nine thousand, nine hundred eighty-nine".