218365438663 has 2 divisors, whose sum is σ = 218365438664. Its totient is φ = 218365438662.

The previous prime is 218365438649. The next prime is 218365438691. The reversal of 218365438663 is 366834563812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218365438663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218365438363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109182719331 + 109182719332.

It is an arithmetic number, because the mean of its divisors is an integer number (109182719332).

Almost surely, 2^218365438663 is an apocalyptic number.

218365438663 is a deficient number, since it is larger than the sum of its proper divisors (1).

218365438663 is an equidigital number, since it uses as much as digits as its factorization.

218365438663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14929920, while the sum is 55.

The spelling of 218365438663 in words is "two hundred eighteen billion, three hundred sixty-five million, four hundred thirty-eight thousand, six hundred sixty-three".