2166169980991 has 4 divisors (see below), whose sum is σ = 2167180795072. Its totient is φ = 2165159166912.

The previous prime is 2166169980971. The next prime is 2166169981057. The reversal of 2166169980991 is 1990899616612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166169980991 - 2¹¹ = 2166169978943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166169980971) 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 3 ways as a sum of consecutive naturals, for example, 505403826 + ... + 505408111.

It is an arithmetic number, because the mean of its divisors is an integer number (541795198768).

Almost surely, 2^{2166169980991} is an apocalyptic number.

2166169980991 is a deficient number, since it is larger than the sum of its proper divisors (1010814081).

2166169980991 is a wasteful number, since it uses less digits than its factorization.

2166169980991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010814080.

The product of its (nonzero) digits is 22674816, while the sum is 67.

The spelling of 2166169980991 in words is "two trillion, one hundred sixty-six billion, one hundred sixty-nine million, nine hundred eighty thousand, nine hundred ninety-one".