216600638393 has 2 divisors, whose sum is σ = 216600638394. Its totient is φ = 216600638392.

The previous prime is 216600638369. The next prime is 216600638411. The reversal of 216600638393 is 393836006612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134774891689 + 81825746704 = 367117^2 + 286052^2 .

It is a cyclic number.

It is not a de Polignac number, because 216600638393 - 2¹⁰ = 216600637369 is a prime.

It is not a weakly prime, because it can be changed into another prime (216600638693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108300319196 + 108300319197.

It is an arithmetic number, because the mean of its divisors is an integer number (108300319197).

Almost surely, 2^216600638393 is an apocalyptic number.

It is an amenable number.

216600638393 is a deficient number, since it is larger than the sum of its proper divisors (1).

216600638393 is an equidigital number, since it uses as much as digits as its factorization.

216600638393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 47.

The spelling of 216600638393 in words is "two hundred sixteen billion, six hundred million, six hundred thirty-eight thousand, three hundred ninety-three".