2168661634689 has 16 divisors (see below), whose sum is σ = 3154464278784. Its totient is φ = 1314320653200.

The previous prime is 2168661634687. The next prime is 2168661634751. The reversal of 2168661634689 is 9864361668612.

It is not a de Polignac number, because 2168661634689 - 2¹ = 2168661634687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2168661634687) by changing a digit.

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, 1913454 + ... + 2828184.

It is an arithmetic number, because the mean of its divisors is an integer number (197154017424).

Almost surely, 2^{2168661634689} is an apocalyptic number.

It is an amenable number.

2168661634689 is a deficient number, since it is larger than the sum of its proper divisors (985802644095).

2168661634689 is a wasteful number, since it uses less digits than its factorization.

2168661634689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986588.

The product of its digits is 107495424, while the sum is 66.

The spelling of 2168661634689 in words is "two trillion, one hundred sixty-eight billion, six hundred sixty-one million, six hundred thirty-four thousand, six hundred eighty-nine".