205546240897 has 2 divisors, whose sum is σ = 205546240898. Its totient is φ = 205546240896.

The previous prime is 205546240849. The next prime is 205546240937. The reversal of 205546240897 is 798042645502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179237076496 + 26309164401 = 423364^2 + 162201^2 .

It is a cyclic number.

It is not a de Polignac number, because 205546240897 - 2⁷ = 205546240769 is a prime.

It is not a weakly prime, because it can be changed into another prime (205546240597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102773120448 + 102773120449.

It is an arithmetic number, because the mean of its divisors is an integer number (102773120449).

Almost surely, 2^205546240897 is an apocalyptic number.

It is an amenable number.

205546240897 is a deficient number, since it is larger than the sum of its proper divisors (1).

205546240897 is an equidigital number, since it uses as much as digits as its factorization.

205546240897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4838400, while the sum is 52.

The spelling of 205546240897 in words is "two hundred five billion, five hundred forty-six million, two hundred forty thousand, eight hundred ninety-seven".