205666254556 has 12 divisors (see below), whose sum is σ = 411332509168. Its totient is φ = 88142680512.

The previous prime is 205666254527. The next prime is 205666254601. The reversal of 205666254556 is 655452666502.

205666254556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

205666254556 is an admirable number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3672611661 + ... + 3672611716.

Almost surely, 2^205666254556 is an apocalyptic number.

It is an amenable number.

205666254556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205666254556 is a wasteful number, since it uses less digits than its factorization.

205666254556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7345223388 (or 7345223386 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 52.

The spelling of 205666254556 in words is "two hundred five billion, six hundred sixty-six million, two hundred fifty-four thousand, five hundred fifty-six".