205056616505605 has 32 divisors (see below), whose sum is σ = 259243307850240. Its totient is φ = 155276723796480.

The previous prime is 205056616505593. The next prime is 205056616505773. The reversal of 205056616505605 is 506505616650502.

It is not a de Polignac number, because 205056616505605 - 2²¹ = 205056614408453 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 629786329 + ... + 630111841.

It is an arithmetic number, because the mean of its divisors is an integer number (8101353370320).

Almost surely, 2^{205056616505605} is an apocalyptic number.

It is an amenable number.

205056616505605 is a deficient number, since it is larger than the sum of its proper divisors (54186691344635).

205056616505605 is a wasteful number, since it uses less digits than its factorization.

205056616505605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331261.

The product of its (nonzero) digits is 8100000, while the sum is 52.

The spelling of 205056616505605 in words is "two hundred five trillion, fifty-six billion, six hundred sixteen million, five hundred five thousand, six hundred five".