16665055566 has 32 divisors (see below), whose sum is σ = 33891758208. Its totient is φ = 5462046240.

The previous prime is 16665055541. The next prime is 16665055577. The reversal of 16665055566 is 66555056661.

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, 25780 + ... + 184376.

It is an arithmetic number, because the mean of its divisors is an integer number (1059117444).

Almost surely, 2^16665055566 is an apocalyptic number.

16665055566 is an abundant number, since it is smaller than the sum of its proper divisors (17226702642).

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

16665055566 is a wasteful number, since it uses less digits than its factorization.

16665055566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158896.

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 16665055566 in words is "sixteen billion, six hundred sixty-five million, fifty-five thousand, five hundred sixty-six".