2166328582685 has 8 divisors (see below), whose sum is σ = 2599607198040. Its totient is φ = 1733054266944.

The previous prime is 2166328582679. The next prime is 2166328582687. The reversal of 2166328582685 is 5862858236612.

It can be written as a sum of positive squares in 4 ways, for example, as 5011082521 + 2161317500164 = 70789^2 + 1470142^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166328582685 - 2¹⁴ = 2166328566301 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166328582687) 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 7 ways as a sum of consecutive naturals, for example, 163199 + ... + 2087891.

It is an arithmetic number, because the mean of its divisors is an integer number (324950899755).

Almost surely, 2^{2166328582685} is an apocalyptic number.

It is an amenable number.

2166328582685 is a deficient number, since it is larger than the sum of its proper divisors (433278615355).

2166328582685 is a wasteful number, since it uses less digits than its factorization.

2166328582685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149807.

The product of its digits is 66355200, while the sum is 62.

The spelling of 2166328582685 in words is "two trillion, one hundred sixty-six billion, three hundred twenty-eight million, five hundred eighty-two thousand, six hundred eighty-five".