205353443557 has 2 divisors, whose sum is σ = 205353443558. Its totient is φ = 205353443556.

The previous prime is 205353443497. The next prime is 205353443567. The reversal of 205353443557 is 755344353502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123061341601 + 82292101956 = 350801^2 + 286866^2 .

It is a cyclic number.

It is not a de Polignac number, because 205353443557 - 2³¹ = 203205959909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205353443567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102676721778 + 102676721779.

It is an arithmetic number, because the mean of its divisors is an integer number (102676721779).

Almost surely, 2^205353443557 is an apocalyptic number.

It is an amenable number.

205353443557 is a deficient number, since it is larger than the sum of its proper divisors (1).

205353443557 is an equidigital number, since it uses as much as digits as its factorization.

205353443557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780000, while the sum is 46.

The spelling of 205353443557 in words is "two hundred five billion, three hundred fifty-three million, four hundred forty-three thousand, five hundred fifty-seven".