205772106666 has 32 divisors (see below), whose sum is σ = 470459703168. Its totient is φ = 58776598080.

The previous prime is 205772106643. The next prime is 205772106731. The reversal of 205772106666 is 666601277502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480625 + ... + 801588.

It is an arithmetic number, because the mean of its divisors is an integer number (14701865724).

Almost surely, 2^205772106666 is an apocalyptic number.

205772106666 is an abundant number, since it is smaller than the sum of its proper divisors (264687596502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205772106666 is a wasteful number, since it uses less digits than its factorization.

205772106666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286046.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 205772106666 in words is "two hundred five billion, seven hundred seventy-two million, one hundred six thousand, six hundred sixty-six".