205143242262305 has 8 divisors (see below), whose sum is σ = 246227877070632. Its totient is φ = 164077269572608.

The previous prime is 205143242262253. The next prime is 205143242262349. The reversal of 205143242262305 is 503262242341502.

It can be written as a sum of positive squares in 4 ways, for example, as 28892871793681 + 176250370468624 = 5375209^2 + 13275932^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205143242262305 - 2³⁴ = 205126062393121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4665505472 + ... + 4665549441.

It is an arithmetic number, because the mean of its divisors is an integer number (30778484633829).

Almost surely, 2^{205143242262305} is an apocalyptic number.

It is an amenable number.

205143242262305 is a deficient number, since it is larger than the sum of its proper divisors (41084634808327).

205143242262305 is an equidigital number, since it uses as much as digits as its factorization.

205143242262305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9331059315.

The product of its (nonzero) digits is 691200, while the sum is 41.

The spelling of 205143242262305 in words is "two hundred five trillion, one hundred forty-three billion, two hundred forty-two million, two hundred sixty-two thousand, three hundred five".