20168163112805 has 16 divisors (see below), whose sum is σ = 26068029683520. Its totient is φ = 14929871539968.

The previous prime is 20168163112759. The next prime is 20168163112819. The reversal of 20168163112805 is 50821136186102.

It is a cyclic number.

It is not a de Polignac number, because 20168163112805 - 2¹⁶ = 20168163047269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2468559332 + ... + 2468567501.

It is an arithmetic number, because the mean of its divisors is an integer number (1629251855220).

Almost surely, 2^{20168163112805} is an apocalyptic number.

It is an amenable number.

20168163112805 is a deficient number, since it is larger than the sum of its proper divisors (5899866570715).

20168163112805 is a wasteful number, since it uses less digits than its factorization.

20168163112805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4937126900.

The product of its (nonzero) digits is 138240, while the sum is 44.

Adding to 20168163112805 its reverse (50821136186102), we get a palindrome (70989299298907).

The spelling of 20168163112805 in words is "twenty trillion, one hundred sixty-eight billion, one hundred sixty-three million, one hundred twelve thousand, eight hundred five".