18216320835143 has 2 divisors, whose sum is σ = 18216320835144. Its totient is φ = 18216320835142.

The previous prime is 18216320835103. The next prime is 18216320835179. The reversal of 18216320835143 is 34153802361281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18216320835143 - 2¹⁸ = 18216320572999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18216320835103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9108160417571 + 9108160417572.

It is an arithmetic number, because the mean of its divisors is an integer number (9108160417572).

Almost surely, 2^{18216320835143} is an apocalyptic number.

18216320835143 is a deficient number, since it is larger than the sum of its proper divisors (1).

18216320835143 is an equidigital number, since it uses as much as digits as its factorization.

18216320835143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 18216320835143 in words is "eighteen trillion, two hundred sixteen billion, three hundred twenty million, eight hundred thirty-five thousand, one hundred forty-three".