206668543 has 2 divisors, whose sum is σ = 206668544. Its totient is φ = 206668542.

The previous prime is 206668531. The next prime is 206668597. The reversal of 206668543 is 345866602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206668543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206668496 and 206668505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206668843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103334271 + 103334272.

It is an arithmetic number, because the mean of its divisors is an integer number (103334272).

Almost surely, 2^206668543 is an apocalyptic number.

206668543 is a deficient number, since it is larger than the sum of its proper divisors (1).

206668543 is an equidigital number, since it uses as much as digits as its factorization.

206668543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 206668543 is about 14375.9710280732. The cubic root of 206668543 is about 591.2322641275.

The spelling of 206668543 in words is "two hundred six million, six hundred sixty-eight thousand, five hundred forty-three".