205861170666 has 32 divisors (see below), whose sum is σ = 413037979200. Its totient is φ = 68401468800.

The previous prime is 205861170631. The next prime is 205861170667. The reversal of 205861170666 is 666071168502.

It is not an unprimeable number, because it can be changed into a prime (205861170667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2333040 + ... + 2419668.

It is an arithmetic number, because the mean of its divisors is an integer number (12907436850).

Almost surely, 2^205861170666 is an apocalyptic number.

205861170666 is an abundant number, since it is smaller than the sum of its proper divisors (207176808534).

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

205861170666 is a wasteful number, since it uses less digits than its factorization.

205861170666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87894.

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 205861170666 in words is "two hundred five billion, eight hundred sixty-one million, one hundred seventy thousand, six hundred sixty-six".