205215355331243 has 2 divisors, whose sum is σ = 205215355331244. Its totient is φ = 205215355331242.

The previous prime is 205215355331227. The next prime is 205215355331279. The reversal of 205215355331243 is 342133553512502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205215355331243 - 2⁴ = 205215355331227 is a prime.

It is a super-2 number, since 2×205215355331243² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205215355331194 and 205215355331203.

It is not a weakly prime, because it can be changed into another prime (205215355331293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102607677665621 + 102607677665622.

It is an arithmetic number, because the mean of its divisors is an integer number (102607677665622).

Almost surely, 2^{205215355331243} is an apocalyptic number.

205215355331243 is a deficient number, since it is larger than the sum of its proper divisors (1).

205215355331243 is an equidigital number, since it uses as much as digits as its factorization.

205215355331243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620000, while the sum is 44.

The spelling of 205215355331243 in words is "two hundred five trillion, two hundred fifteen billion, three hundred fifty-five million, three hundred thirty-one thousand, two hundred forty-three".