205697663066 has 16 divisors (see below), whose sum is σ = 363999552000. Its totient is φ = 85312394640.

The previous prime is 205697663023. The next prime is 205697663089. The reversal of 205697663066 is 660366796502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236978441 + ... + 236979308.

It is an arithmetic number, because the mean of its divisors is an integer number (22749972000).

Almost surely, 2^205697663066 is an apocalyptic number.

205697663066 is a deficient number, since it is larger than the sum of its proper divisors (158301888934).

205697663066 is a wasteful number, since it uses less digits than its factorization.

205697663066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473957789.

The product of its (nonzero) digits is 14696640, while the sum is 56.

The spelling of 205697663066 in words is "two hundred five billion, six hundred ninety-seven million, six hundred sixty-three thousand, sixty-six".