18172873211 has 2 divisors, whose sum is σ = 18172873212. Its totient is φ = 18172873210.

The previous prime is 18172873207. The next prime is 18172873223. The reversal of 18172873211 is 11237827181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18172873211 - 2² = 18172873207 is a prime.

It is not a weakly prime, because it can be changed into another prime (18171873211) 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, 9086436605 + 9086436606.

It is an arithmetic number, because the mean of its divisors is an integer number (9086436606).

Almost surely, 2^18172873211 is an apocalyptic number.

18172873211 is a deficient number, since it is larger than the sum of its proper divisors (1).

18172873211 is an equidigital number, since it uses as much as digits as its factorization.

18172873211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 41.

The spelling of 18172873211 in words is "eighteen billion, one hundred seventy-two million, eight hundred seventy-three thousand, two hundred eleven".