18122156287 has 2 divisors, whose sum is σ = 18122156288. Its totient is φ = 18122156286.

The previous prime is 18122156249. The next prime is 18122156293. The reversal of 18122156287 is 78265122181.

It is a strong prime.

It is an emirp because it is prime and its reverse (78265122181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18122156287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18122156687) 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, 9061078143 + 9061078144.

It is an arithmetic number, because the mean of its divisors is an integer number (9061078144).

Almost surely, 2^18122156287 is an apocalyptic number.

18122156287 is a deficient number, since it is larger than the sum of its proper divisors (1).

18122156287 is an equidigital number, since it uses as much as digits as its factorization.

18122156287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 43.

The spelling of 18122156287 in words is "eighteen billion, one hundred twenty-two million, one hundred fifty-six thousand, two hundred eighty-seven".