2168605819 has 4 divisors (see below), whose sum is σ = 2243385360. Its totient is φ = 2093826280.

The previous prime is 2168605801. The next prime is 2168605841. The reversal of 2168605819 is 9185068612.

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 2168605819 - 2¹⁵ = 2168573051 is a prime.

It is a super-2 number, since 2×2168605819² = 9405702396401321522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2168605319) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 37389727 + ... + 37389784.

It is an arithmetic number, because the mean of its divisors is an integer number (560846340).

Almost surely, 2^2168605819 is an apocalyptic number.

2168605819 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2168605819 is a deficient number, since it is larger than the sum of its proper divisors (74779541).

2168605819 is an equidigital number, since it uses as much as digits as its factorization.

2168605819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74779540.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 2168605819 is about 46568.2919914398. The cubic root of 2168605819 is about 1294.3752683012.

The spelling of 2168605819 in words is "two billion, one hundred sixty-eight million, six hundred five thousand, eight hundred nineteen".