206391857773 has 2 divisors, whose sum is σ = 206391857774. Its totient is φ = 206391857772.

The previous prime is 206391857761. The next prime is 206391857801. The reversal of 206391857773 is 377758193602.

It is a happy number.

206391857773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188496642244 + 17895215529 = 434162^2 + 133773^2 .

It is a cyclic number.

It is not a de Polignac number, because 206391857773 - 2⁹ = 206391857261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206391857723) 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, 103195928886 + 103195928887.

It is an arithmetic number, because the mean of its divisors is an integer number (103195928887).

Almost surely, 2^206391857773 is an apocalyptic number.

It is an amenable number.

206391857773 is a deficient number, since it is larger than the sum of its proper divisors (1).

206391857773 is an equidigital number, since it uses as much as digits as its factorization.

206391857773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13335840, while the sum is 58.

The spelling of 206391857773 in words is "two hundred six billion, three hundred ninety-one million, eight hundred fifty-seven thousand, seven hundred seventy-three".