205428217017205 has 32 divisors (see below), whose sum is σ = 303480544034304. Its totient is φ = 129995487726336.

The previous prime is 205428217017203. The next prime is 205428217017209. The reversal of 205428217017205 is 502710712824502.

It is a cyclic number.

It is not a de Polignac number, because 205428217017205 - 2¹ = 205428217017203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205428217017203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56930482 + ... + 60431251.

It is an arithmetic number, because the mean of its divisors is an integer number (9483767001072).

Almost surely, 2^{205428217017205} is an apocalyptic number.

It is an amenable number.

205428217017205 is a deficient number, since it is larger than the sum of its proper divisors (98052327017099).

205428217017205 is a wasteful number, since it uses less digits than its factorization.

205428217017205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117365605.

The product of its (nonzero) digits is 627200, while the sum is 46.

The spelling of 205428217017205 in words is "two hundred five trillion, four hundred twenty-eight billion, two hundred seventeen million, seventeen thousand, two hundred five".