206488680857 has 2 divisors, whose sum is σ = 206488680858. Its totient is φ = 206488680856.

The previous prime is 206488680709. The next prime is 206488680911. The reversal of 206488680857 is 758086884602.

206488680857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200507823961 + 5980856896 = 447781^2 + 77336^2 .

It is a cyclic number.

It is not a de Polignac number, because 206488680857 - 2²⁴ = 206471903641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206488680857.

It is not a weakly prime, because it can be changed into another prime (206488280857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103244340428 + 103244340429.

It is an arithmetic number, because the mean of its divisors is an integer number (103244340429).

Almost surely, 2^206488680857 is an apocalyptic number.

It is an amenable number.

206488680857 is a deficient number, since it is larger than the sum of its proper divisors (1).

206488680857 is an equidigital number, since it uses as much as digits as its factorization.

206488680857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41287680, while the sum is 62.

The spelling of 206488680857 in words is "two hundred six billion, four hundred eighty-eight million, six hundred eighty thousand, eight hundred fifty-seven".