205043725643 has 2 divisors, whose sum is σ = 205043725644. Its totient is φ = 205043725642.

The previous prime is 205043725609. The next prime is 205043725651. The reversal of 205043725643 is 346527340502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205043725643 - 2³⁴ = 187863856459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205043725643.

It is not a weakly prime, because it can be changed into another prime (205043725043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102521862821 + 102521862822.

It is an arithmetic number, because the mean of its divisors is an integer number (102521862822).

Almost surely, 2^205043725643 is an apocalyptic number.

205043725643 is a deficient number, since it is larger than the sum of its proper divisors (1).

205043725643 is an equidigital number, since it uses as much as digits as its factorization.

205043725643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 41.

The spelling of 205043725643 in words is "two hundred five billion, forty-three million, seven hundred twenty-five thousand, six hundred forty-three".