205777824911 has 2 divisors, whose sum is σ = 205777824912. Its totient is φ = 205777824910.

The previous prime is 205777824893. The next prime is 205777824913. The reversal of 205777824911 is 119428777502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205777824911 is a prime.

It is a Sophie Germain prime.

Together with 205777824913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205777824913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102888912455 + 102888912456.

It is an arithmetic number, because the mean of its divisors is an integer number (102888912456).

Almost surely, 2^205777824911 is an apocalyptic number.

205777824911 is a deficient number, since it is larger than the sum of its proper divisors (1).

205777824911 is an equidigital number, since it uses as much as digits as its factorization.

205777824911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 53.

The spelling of 205777824911 in words is "two hundred five billion, seven hundred seventy-seven million, eight hundred twenty-four thousand, nine hundred eleven".