16505566166 has 16 divisors (see below), whose sum is σ = 25619079600. Its totient is φ = 7966028448.

The previous prime is 16505566163. The next prime is 16505566177. The reversal of 16505566166 is 66166550561.

It is a self number, because there is not a number n which added to its sum of digits gives 16505566166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505566163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186545 + ... + 260403.

It is an arithmetic number, because the mean of its divisors is an integer number (1601192475).

Almost surely, 2^16505566166 is an apocalyptic number.

16505566166 is a deficient number, since it is larger than the sum of its proper divisors (9113513434).

16505566166 is a wasteful number, since it uses less digits than its factorization.

16505566166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77743.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 16505566166 in words is "sixteen billion, five hundred five million, five hundred sixty-six thousand, one hundred sixty-six".