1800181800191 has 2 divisors, whose sum is σ = 1800181800192. Its totient is φ = 1800181800190.

The previous prime is 1800181800169. The next prime is 1800181800223. The reversal of 1800181800191 is 1910081810081.

It is a weak prime.

It is an emirp because it is prime and its reverse (1910081810081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1800181800191 - 2¹⁰ = 1800181799167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800181890191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900090900095 + 900090900096.

It is an arithmetic number, because the mean of its divisors is an integer number (900090900096).

Almost surely, 2^{1800181800191} is an apocalyptic number.

1800181800191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800181800191 is an equidigital number, since it uses as much as digits as its factorization.

1800181800191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 38.

The spelling of 1800181800191 in words is "one trillion, eight hundred billion, one hundred eighty-one million, eight hundred thousand, one hundred ninety-one".