18851900189 has 2 divisors, whose sum is σ = 18851900190. Its totient is φ = 18851900188.

The previous prime is 18851900153. The next prime is 18851900201. The reversal of 18851900189 is 98100915881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18675408964 + 176491225 = 136658^2 + 13285^2 .

It is a cyclic number.

It is not a de Polignac number, because 18851900189 - 2¹² = 18851896093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18851902189) 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, 9425950094 + 9425950095.

It is an arithmetic number, because the mean of its divisors is an integer number (9425950095).

Almost surely, 2^18851900189 is an apocalyptic number.

It is an amenable number.

18851900189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18851900189 is an equidigital number, since it uses as much as digits as its factorization.

18851900189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 50.

The spelling of 18851900189 in words is "eighteen billion, eight hundred fifty-one million, nine hundred thousand, one hundred eighty-nine".