18851288189 has 2 divisors, whose sum is σ = 18851288190. Its totient is φ = 18851288188.

The previous prime is 18851288149. The next prime is 18851288227. The reversal of 18851288189 is 98188215881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17792892100 + 1058396089 = 133390^2 + 32533^2 .

It is a cyclic number.

It is not a de Polignac number, because 18851288189 - 2²⁴ = 18834510973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18851288149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9425644094 + 9425644095.

It is an arithmetic number, because the mean of its divisors is an integer number (9425644095).

Almost surely, 2^18851288189 is an apocalyptic number.

It is an amenable number.

18851288189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18851288189 is an equidigital number, since it uses as much as digits as its factorization.

18851288189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2949120, while the sum is 59.

The spelling of 18851288189 in words is "eighteen billion, eight hundred fifty-one million, two hundred eighty-eight thousand, one hundred eighty-nine".