205428217017203 has 2 divisors, whose sum is σ = 205428217017204. Its totient is φ = 205428217017202.

The previous prime is 205428217017181. The next prime is 205428217017209. The reversal of 205428217017203 is 302710712824502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205428217017203 - 2²⁰ = 205428215968627 is a prime.

It is not a weakly prime, because it can be changed into another prime (205428217017209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102714108508601 + 102714108508602.

It is an arithmetic number, because the mean of its divisors is an integer number (102714108508602).

Almost surely, 2^{205428217017203} is an apocalyptic number.

205428217017203 is a deficient number, since it is larger than the sum of its proper divisors (1).

205428217017203 is an equidigital number, since it uses as much as digits as its factorization.

205428217017203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 376320, while the sum is 44.

The spelling of 205428217017203 in words is "two hundred five trillion, four hundred twenty-eight billion, two hundred seventeen million, seventeen thousand, two hundred three".