18189444011 has 2 divisors, whose sum is σ = 18189444012. Its totient is φ = 18189444010.

The previous prime is 18189443971. The next prime is 18189444017. The reversal of 18189444011 is 11044498181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18189444011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18189444011.

It is not a weakly prime, because it can be changed into another prime (18189444017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9094722005 + 9094722006.

It is an arithmetic number, because the mean of its divisors is an integer number (9094722006).

Almost surely, 2^18189444011 is an apocalyptic number.

18189444011 is a deficient number, since it is larger than the sum of its proper divisors (1).

18189444011 is an equidigital number, since it uses as much as digits as its factorization.

18189444011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 41.

The spelling of 18189444011 in words is "eighteen billion, one hundred eighty-nine million, four hundred forty-four thousand, eleven".