206646368429 has 2 divisors, whose sum is σ = 206646368430. Its totient is φ = 206646368428.

The previous prime is 206646368329. The next prime is 206646368431. The reversal of 206646368429 is 924863646602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188178102025 + 18468266404 = 433795^2 + 135898^2 .

It is a cyclic number.

It is not a de Polignac number, because 206646368429 - 2²⁸ = 206377932973 is a prime.

Together with 206646368431, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206646368479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103323184214 + 103323184215.

It is an arithmetic number, because the mean of its divisors is an integer number (103323184215).

Almost surely, 2^206646368429 is an apocalyptic number.

It is an amenable number.

206646368429 is a deficient number, since it is larger than the sum of its proper divisors (1).

206646368429 is an equidigital number, since it uses as much as digits as its factorization.

206646368429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17915904, while the sum is 56.

The spelling of 206646368429 in words is "two hundred six billion, six hundred forty-six million, three hundred sixty-eight thousand, four hundred twenty-nine".