206555405993 has 2 divisors, whose sum is σ = 206555405994. Its totient is φ = 206555405992.

The previous prime is 206555405977. The next prime is 206555406077. The reversal of 206555405993 is 399504555602.

206555405993 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., 200481853504 + 6073552489 = 447752^2 + 77933^2 .

It is a cyclic number.

It is not a de Polignac number, because 206555405993 - 2⁴ = 206555405977 is a prime.

It is not a weakly prime, because it can be changed into another prime (206555405933) 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, 103277702996 + 103277702997.

It is an arithmetic number, because the mean of its divisors is an integer number (103277702997).

Almost surely, 2^206555405993 is an apocalyptic number.

It is an amenable number.

206555405993 is a deficient number, since it is larger than the sum of its proper divisors (1).

206555405993 is an equidigital number, since it uses as much as digits as its factorization.

206555405993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290000, while the sum is 53.

The spelling of 206555405993 in words is "two hundred six billion, five hundred fifty-five million, four hundred five thousand, nine hundred ninety-three".