205553544247 has 2 divisors, whose sum is σ = 205553544248. Its totient is φ = 205553544246.

The previous prime is 205553544187. The next prime is 205553544253. The reversal of 205553544247 is 742445355502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205553544247 - 2¹¹ = 205553542199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205553544197 and 205553544206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205553544257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102776772123 + 102776772124.

It is an arithmetic number, because the mean of its divisors is an integer number (102776772124).

Almost surely, 2^205553544247 is an apocalyptic number.

205553544247 is a deficient number, since it is larger than the sum of its proper divisors (1).

205553544247 is an equidigital number, since it uses as much as digits as its factorization.

205553544247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360000, while the sum is 46.

Adding to 205553544247 its reverse (742445355502), we get a palindrome (947998899749).

The spelling of 205553544247 in words is "two hundred five billion, five hundred fifty-three million, five hundred forty-four thousand, two hundred forty-seven".