2168643805 has 8 divisors (see below), whose sum is σ = 2603718144. Its totient is φ = 1734018000.

The previous prime is 2168643787. The next prime is 2168643817. The reversal of 2168643805 is 5083468612.

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

It is not a de Polignac number, because 2168643805 - 2⁹ = 2168643293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101401 + ... + 120910.

It is an arithmetic number, because the mean of its divisors is an integer number (325464768).

Almost surely, 2^2168643805 is an apocalyptic number.

It is an amenable number.

2168643805 is a deficient number, since it is larger than the sum of its proper divisors (435074339).

2168643805 is a wasteful number, since it uses less digits than its factorization.

2168643805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224267.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 2168643805 is about 46568.6998422760. The cubic root of 2168643805 is about 1294.3828258222.

The spelling of 2168643805 in words is "two billion, one hundred sixty-eight million, six hundred forty-three thousand, eight hundred five".