18121020163 has 2 divisors, whose sum is σ = 18121020164. Its totient is φ = 18121020162.

The previous prime is 18121020161. The next prime is 18121020167. The reversal of 18121020163 is 36102012181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18121020163 - 2¹ = 18121020161 is a prime.

Together with 18121020161, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18121020161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9060510081 + 9060510082.

It is an arithmetic number, because the mean of its divisors is an integer number (9060510082).

Almost surely, 2^18121020163 is an apocalyptic number.

18121020163 is a deficient number, since it is larger than the sum of its proper divisors (1).

18121020163 is an equidigital number, since it uses as much as digits as its factorization.

18121020163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 18121020163 in words is "eighteen billion, one hundred twenty-one million, twenty thousand, one hundred sixty-three".