20565524820166 has 32 divisors (see below), whose sum is σ = 30941326155168. Its totient is φ = 10251804622080.

The previous prime is 20565524820163. The next prime is 20565524820179. The reversal of 20565524820166 is 66102842556502.

It is a super-2 number, since 2×20565524820166² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20565524820161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5781703260 + ... + 5781706816.

It is an arithmetic number, because the mean of its divisors is an integer number (966916442349).

Almost surely, 2^{20565524820166} is an apocalyptic number.

20565524820166 is a deficient number, since it is larger than the sum of its proper divisors (10375801335002).

20565524820166 is a wasteful number, since it uses less digits than its factorization.

20565524820166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9096.

The product of its (nonzero) digits is 6912000, while the sum is 52.

The spelling of 20565524820166 in words is "twenty trillion, five hundred sixty-five billion, five hundred twenty-four million, eight hundred twenty thousand, one hundred sixty-six".