18685371127 has 2 divisors, whose sum is σ = 18685371128. Its totient is φ = 18685371126.

The previous prime is 18685371121. The next prime is 18685371149. The reversal of 18685371127 is 72117358681.

It is a weak prime.

It is an emirp because it is prime and its reverse (72117358681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18685371127 - 2²⁷ = 18551153399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18685371121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342685563 + 9342685564.

It is an arithmetic number, because the mean of its divisors is an integer number (9342685564).

Almost surely, 2^18685371127 is an apocalyptic number.

18685371127 is a deficient number, since it is larger than the sum of its proper divisors (1).

18685371127 is an equidigital number, since it uses as much as digits as its factorization.

18685371127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 49.

The spelling of 18685371127 in words is "eighteen billion, six hundred eighty-five million, three hundred seventy-one thousand, one hundred twenty-seven".