205311954893 has 2 divisors, whose sum is σ = 205311954894. Its totient is φ = 205311954892.

The previous prime is 205311954871. The next prime is 205311954899. The reversal of 205311954893 is 398459113502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195786780484 + 9525174409 = 442478^2 + 97597^2 .

It is a cyclic number.

It is not a de Polignac number, because 205311954893 - 2⁶ = 205311954829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205311954899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102655977446 + 102655977447.

It is an arithmetic number, because the mean of its divisors is an integer number (102655977447).

Almost surely, 2^205311954893 is an apocalyptic number.

It is an amenable number.

205311954893 is a deficient number, since it is larger than the sum of its proper divisors (1).

205311954893 is an equidigital number, since it uses as much as digits as its factorization.

205311954893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 50.

It can be divided in two parts, 2053119 and 54893, that added together give a palindrome (2108012).

The spelling of 205311954893 in words is "two hundred five billion, three hundred eleven million, nine hundred fifty-four thousand, eight hundred ninety-three".