205552057 has 4 divisors (see below), whose sum is σ = 211107556. Its totient is φ = 199996560.

The previous prime is 205552031. The next prime is 205552097. The reversal of 205552057 is 750255502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 117267241 + 88284816 = 10829^2 + 9396^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205552057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205552027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777694 + ... + 2777767.

It is an arithmetic number, because the mean of its divisors is an integer number (52776889).

Almost surely, 2^205552057 is an apocalyptic number.

It is an amenable number.

205552057 is a deficient number, since it is larger than the sum of its proper divisors (5555499).

205552057 is an equidigital number, since it uses as much as digits as its factorization.

205552057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555498.

The product of its (nonzero) digits is 17500, while the sum is 31.

The square root of 205552057 is about 14337.0867682385. The cubic root of 205552057 is about 590.1656692670.

The spelling of 205552057 in words is "two hundred five million, five hundred fifty-two thousand, fifty-seven".