205606655 has 4 divisors (see below), whose sum is σ = 246727992. Its totient is φ = 164485320.

The previous prime is 205606649. The next prime is 205606673. The reversal of 205606655 is 556606502.

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

It is not a de Polignac number, because 205606655 - 2¹² = 205602559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20560661 + ... + 20560670.

It is an arithmetic number, because the mean of its divisors is an integer number (61681998).

Almost surely, 2^205606655 is an apocalyptic number.

205606655 is a deficient number, since it is larger than the sum of its proper divisors (41121337).

205606655 is an equidigital number, since it uses as much as digits as its factorization.

205606655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41121336.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 205606655 is about 14338.9907245943. The cubic root of 205606655 is about 590.2179172039.

The spelling of 205606655 in words is "two hundred five million, six hundred six thousand, six hundred fifty-five".