205512500243 has 2 divisors, whose sum is σ = 205512500244. Its totient is φ = 205512500242.

The previous prime is 205512500227. The next prime is 205512500371. The reversal of 205512500243 is 342005215502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205512500243 - 2⁴ = 205512500227 is a prime.

It is a super-2 number, since 2×205512500243² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205512500203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102756250121 + 102756250122.

It is an arithmetic number, because the mean of its divisors is an integer number (102756250122).

Almost surely, 2^205512500243 is an apocalyptic number.

205512500243 is a deficient number, since it is larger than the sum of its proper divisors (1).

205512500243 is an equidigital number, since it uses as much as digits as its factorization.

205512500243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 205512500243 its reverse (342005215502), we get a palindrome (547517715745).

The spelling of 205512500243 in words is "two hundred five billion, five hundred twelve million, five hundred thousand, two hundred forty-three".