18668203427 has 2 divisors, whose sum is σ = 18668203428. Its totient is φ = 18668203426.

The previous prime is 18668203357. The next prime is 18668203429. The reversal of 18668203427 is 72430286681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18668203427 - 2¹² = 18668199331 is a prime.

Together with 18668203429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18668203429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9334101713 + 9334101714.

It is an arithmetic number, because the mean of its divisors is an integer number (9334101714).

Almost surely, 2^18668203427 is an apocalyptic number.

18668203427 is a deficient number, since it is larger than the sum of its proper divisors (1).

18668203427 is an equidigital number, since it uses as much as digits as its factorization.

18668203427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 18668203427 in words is "eighteen billion, six hundred sixty-eight million, two hundred three thousand, four hundred twenty-seven".