20166636165 has 32 divisors (see below), whose sum is σ = 35092745856. Its totient is φ = 9829881600.

The previous prime is 20166636151. The next prime is 20166636167. The reversal of 20166636165 is 56163666102.

It is not a de Polignac number, because 20166636165 - 2⁷ = 20166636037 is a prime.

It is a super-2 number, since 2×20166636165² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166636167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 492279 + ... + 531668.

It is an arithmetic number, because the mean of its divisors is an integer number (1096648308).

Almost surely, 2^20166636165 is an apocalyptic number.

It is an amenable number.

20166636165 is a deficient number, since it is larger than the sum of its proper divisors (14926109691).

20166636165 is a wasteful number, since it uses less digits than its factorization.

20166636165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024069.

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 20166636165 in words is "twenty billion, one hundred sixty-six million, six hundred thirty-six thousand, one hundred sixty-five".