205056557 has 2 divisors, whose sum is σ = 205056558. Its totient is φ = 205056556.

The previous prime is 205056497. The next prime is 205056559. The reversal of 205056557 is 755650502.

205056557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199204996 + 5851561 = 14114^2 + 2419^2 .

It is a cyclic number.

It is not a de Polignac number, because 205056557 - 2⁸ = 205056301 is a prime.

Together with 205056559, 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 (205056559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102528278 + 102528279.

It is an arithmetic number, because the mean of its divisors is an integer number (102528279).

Almost surely, 2^205056557 is an apocalyptic number.

It is an amenable number.

205056557 is a deficient number, since it is larger than the sum of its proper divisors (1).

205056557 is an equidigital number, since it uses as much as digits as its factorization.

205056557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52500, while the sum is 35.

The square root of 205056557 is about 14319.7959831836. The cubic root of 205056557 is about 589.6910735503.

The spelling of 205056557 in words is "two hundred five million, fifty-six thousand, five hundred fifty-seven".