205434354644271 has 6 divisors (see below), whose sum is σ = 296738512263960. Its totient is φ = 136956236429508.

The previous prime is 205434354644243. The next prime is 205434354644279. The reversal of 205434354644271 is 172446453434502.

205434354644271 is a `hidden beast` number, since 2 + 0 + 5 + 4 + 34 + 3 + 546 + 44 + 27 + 1 = 666.

It is not a de Polignac number, because 205434354644271 - 2¹³ = 205434354636079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205434354644279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11413019702451 + ... + 11413019702468.

It is an arithmetic number, because the mean of its divisors is an integer number (49456418710660).

Almost surely, 2^{205434354644271} is an apocalyptic number.

205434354644271 is a deficient number, since it is larger than the sum of its proper divisors (91304157619689).

205434354644271 is a wasteful number, since it uses less digits than its factorization.

205434354644271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22826039404925 (or 22826039404922 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 54.

The spelling of 205434354644271 in words is "two hundred five trillion, four hundred thirty-four billion, three hundred fifty-four million, six hundred forty-four thousand, two hundred seventy-one".