18135378187 has 2 divisors, whose sum is σ = 18135378188. Its totient is φ = 18135378186.

The previous prime is 18135378181. The next prime is 18135378197. The reversal of 18135378187 is 78187353181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18135378187 - 2³ = 18135378179 is a prime.

It is not a weakly prime, because it can be changed into another prime (18135378181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9067689093 + 9067689094.

It is an arithmetic number, because the mean of its divisors is an integer number (9067689094).

Almost surely, 2^18135378187 is an apocalyptic number.

18135378187 is a deficient number, since it is larger than the sum of its proper divisors (1).

18135378187 is an equidigital number, since it uses as much as digits as its factorization.

18135378187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 52.

The spelling of 18135378187 in words is "eighteen billion, one hundred thirty-five million, three hundred seventy-eight thousand, one hundred eighty-seven".