205566655 has 16 divisors (see below), whose sum is σ = 285894144. Its totient is φ = 138972960.

The previous prime is 205566649. The next prime is 205566667. The reversal of 205566655 is 556665502.

205566655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205566655 - 2⁵ = 205566623 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 15 ways as a sum of consecutive naturals, for example, 38877 + ... + 43846.

It is an arithmetic number, because the mean of its divisors is an integer number (17868384).

Almost surely, 2^205566655 is an apocalyptic number.

205566655 is a deficient number, since it is larger than the sum of its proper divisors (80327489).

205566655 is an equidigital number, since it uses as much as digits as its factorization.

205566655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82806.

The product of its (nonzero) digits is 270000, while the sum is 40.

The square root of 205566655 is about 14337.5958584415. The cubic root of 205566655 is about 590.1796398310.

The spelling of 205566655 in words is "two hundred five million, five hundred sixty-six thousand, six hundred fifty-five".