205666453 has 2 divisors, whose sum is σ = 205666454. Its totient is φ = 205666452.

The previous prime is 205666421. The next prime is 205666471. The reversal of 205666453 is 354666502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205578244 + 88209 = 14338^2 + 297^2 .

It is a cyclic number.

It is not a de Polignac number, because 205666453 - 2⁵ = 205666421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205667453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102833226 + 102833227.

It is an arithmetic number, because the mean of its divisors is an integer number (102833227).

Almost surely, 2^205666453 is an apocalyptic number.

It is an amenable number.

205666453 is a deficient number, since it is larger than the sum of its proper divisors (1).

205666453 is an equidigital number, since it uses as much as digits as its factorization.

205666453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 37.

The square root of 205666453 is about 14341.0757267368. The cubic root of 205666453 is about 590.2751307054.

The spelling of 205666453 in words is "two hundred five million, six hundred sixty-six thousand, four hundred fifty-three".