18959518187 has 2 divisors, whose sum is σ = 18959518188. Its totient is φ = 18959518186.

The previous prime is 18959518169. The next prime is 18959518189. The reversal of 18959518187 is 78181595981.

It is a strong prime.

It is an emirp because it is prime and its reverse (78181595981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18959518187 - 2⁸ = 18959517931 is a prime.

Together with 18959518189, 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 (18959518189) 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, 9479759093 + 9479759094.

It is an arithmetic number, because the mean of its divisors is an integer number (9479759094).

Almost surely, 2^18959518187 is an apocalyptic number.

18959518187 is a deficient number, since it is larger than the sum of its proper divisors (1).

18959518187 is an equidigital number, since it uses as much as digits as its factorization.

18959518187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 62.

The spelling of 18959518187 in words is "eighteen billion, nine hundred fifty-nine million, five hundred eighteen thousand, one hundred eighty-seven".