205975750789 has 2 divisors, whose sum is σ = 205975750790. Its totient is φ = 205975750788.

The previous prime is 205975750751. The next prime is 205975750861. The reversal of 205975750789 is 987057579502.

205975750789 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., 111122222500 + 94853528289 = 333350^2 + 307983^2 .

It is a cyclic number.

It is not a de Polignac number, because 205975750789 - 2³¹ = 203828267141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205975750789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205975759789) 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, 102987875394 + 102987875395.

It is an arithmetic number, because the mean of its divisors is an integer number (102987875395).

Almost surely, 2^205975750789 is an apocalyptic number.

It is an amenable number.

205975750789 is a deficient number, since it is larger than the sum of its proper divisors (1).

205975750789 is an equidigital number, since it uses as much as digits as its factorization.

205975750789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55566000, while the sum is 64.

The spelling of 205975750789 in words is "two hundred five billion, nine hundred seventy-five million, seven hundred fifty thousand, seven hundred eighty-nine".