205051142017 has 2 divisors, whose sum is σ = 205051142018. Its totient is φ = 205051142016.

The previous prime is 205051141979. The next prime is 205051142063. The reversal of 205051142017 is 710241150502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183488862736 + 21562279281 = 428356^2 + 146841^2 .

It is a cyclic number.

It is not a de Polignac number, because 205051142017 - 2¹⁹ = 205050617729 is a prime.

It is not a weakly prime, because it can be changed into another prime (205051442017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102525571008 + 102525571009.

It is an arithmetic number, because the mean of its divisors is an integer number (102525571009).

Almost surely, 2^205051142017 is an apocalyptic number.

It is an amenable number.

205051142017 is a deficient number, since it is larger than the sum of its proper divisors (1).

205051142017 is an equidigital number, since it uses as much as digits as its factorization.

205051142017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 28.

Adding to 205051142017 its reverse (710241150502), we get a palindrome (915292292519).

The spelling of 205051142017 in words is "two hundred five billion, fifty-one million, one hundred forty-two thousand, seventeen".