18225181987 has 2 divisors, whose sum is σ = 18225181988. Its totient is φ = 18225181986.

The previous prime is 18225181981. The next prime is 18225182009. The reversal of 18225181987 is 78918152281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18225181987 - 2¹¹ = 18225179939 is a prime.

It is not a weakly prime, because it can be changed into another prime (18225181981) 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, 9112590993 + 9112590994.

It is an arithmetic number, because the mean of its divisors is an integer number (9112590994).

Almost surely, 2^18225181987 is an apocalyptic number.

18225181987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18225181987 is an equidigital number, since it uses as much as digits as its factorization.

18225181987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 52.

The spelling of 18225181987 in words is "eighteen billion, two hundred twenty-five million, one hundred eighty-one thousand, nine hundred eighty-seven".