205606156855 has 16 divisors (see below), whose sum is σ = 284989925664. Its totient is φ = 140735764480.

The previous prime is 205606156849. The next prime is 205606156871. The reversal of 205606156855 is 558651606502.

It is not a de Polignac number, because 205606156855 - 2¹¹ = 205606154807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205606156799 and 205606156808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109948882 + ... + 109950751.

It is an arithmetic number, because the mean of its divisors is an integer number (17811870354).

Almost surely, 2^205606156855 is an apocalyptic number.

205606156855 is a deficient number, since it is larger than the sum of its proper divisors (79383768809).

205606156855 is a wasteful number, since it uses less digits than its factorization.

205606156855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219899666.

The product of its (nonzero) digits is 2160000, while the sum is 49.

The spelling of 205606156855 in words is "two hundred five billion, six hundred six million, one hundred fifty-six thousand, eight hundred fifty-five".