18881340211 has 4 divisors (see below), whose sum is σ = 18882154800. Its totient is φ = 18880525624.

The previous prime is 18881340197. The next prime is 18881340217. The reversal of 18881340211 is 11204318881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18881340211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18881340217) 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 in 3 ways as a sum of consecutive naturals, for example, 371476 + ... + 419233.

It is an arithmetic number, because the mean of its divisors is an integer number (4720538700).

Almost surely, 2^18881340211 is an apocalyptic number.

18881340211 is a deficient number, since it is larger than the sum of its proper divisors (814589).

18881340211 is an equidigital number, since it uses as much as digits as its factorization.

18881340211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814588.

The product of its (nonzero) digits is 12288, while the sum is 37.

The spelling of 18881340211 in words is "eighteen billion, eight hundred eighty-one million, three hundred forty thousand, two hundred eleven".