205566811768 has 64 divisors (see below), whose sum is σ = 397402200000. Its totient is φ = 99654912000.

The previous prime is 205566811699. The next prime is 205566811789. The reversal of 205566811768 is 867118665502.

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, 8535808 + ... + 8559856.

It is an arithmetic number, because the mean of its divisors is an integer number (6209409375).

Almost surely, 2^205566811768 is an apocalyptic number.

It is an amenable number.

205566811768 is a deficient number, since it is larger than the sum of its proper divisors (191835388232).

205566811768 is a wasteful number, since it uses less digits than its factorization.

205566811768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24376 (or 24372 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 205566811768 in words is "two hundred five billion, five hundred sixty-six million, eight hundred eleven thousand, seven hundred sixty-eight".