2168891999 has 8 divisors (see below), whose sum is σ = 2183749248. Its totient is φ = 2154078360.

The previous prime is 2168891993. The next prime is 2168892013. The reversal of 2168891999 is 9991988612.

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 2168891999 - 2¹⁶ = 2168826463 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 (2168891993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92204 + ... + 113310.

It is an arithmetic number, because the mean of its divisors is an integer number (272968656).

Almost surely, 2^2168891999 is an apocalyptic number.

2168891999 is a deficient number, since it is larger than the sum of its proper divisors (14857249).

2168891999 is a wasteful number, since it uses less digits than its factorization.

2168891999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21805.

The product of its digits is 5038848, while the sum is 62.

The square root of 2168891999 is about 46571.3645816826. The cubic root of 2168891999 is about 1294.4322031942.

The spelling of 2168891999 in words is "two billion, one hundred sixty-eight million, eight hundred ninety-one thousand, nine hundred ninety-nine".