205066799996543 has 2 divisors, whose sum is σ = 205066799996544. Its totient is φ = 205066799996542.

The previous prime is 205066799996533. The next prime is 205066799996549. The reversal of 205066799996543 is 345699997660502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205066799996543 - 2¹⁸ = 205066799734399 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205066799996549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102533399998271 + 102533399998272.

It is an arithmetic number, because the mean of its divisors is an integer number (102533399998272).

Almost surely, 2^{205066799996543} is an apocalyptic number.

205066799996543 is a deficient number, since it is larger than the sum of its proper divisors (1).

205066799996543 is an equidigital number, since it uses as much as digits as its factorization.

205066799996543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5952139200, while the sum is 80.

The spelling of 205066799996543 in words is "two hundred five trillion, sixty-six billion, seven hundred ninety-nine million, nine hundred ninety-six thousand, five hundred forty-three".