205869646673 has 2 divisors, whose sum is σ = 205869646674. Its totient is φ = 205869646672.

The previous prime is 205869646649. The next prime is 205869646679. The reversal of 205869646673 is 376646968502.

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., 195923972689 + 9945673984 = 442633^2 + 99728^2 .

It is a cyclic number.

It is not a de Polignac number, because 205869646673 - 2¹⁸ = 205869384529 is a prime.

It is a super-2 number, since 2×205869646673² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (205869646679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102934823336 + 102934823337.

It is an arithmetic number, because the mean of its divisors is an integer number (102934823337).

Almost surely, 2^205869646673 is an apocalyptic number.

It is an amenable number.

205869646673 is a deficient number, since it is larger than the sum of its proper divisors (1).

205869646673 is an equidigital number, since it uses as much as digits as its factorization.

205869646673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78382080, while the sum is 62.

The spelling of 205869646673 in words is "two hundred five billion, eight hundred sixty-nine million, six hundred forty-six thousand, six hundred seventy-three".