2168845663 has 4 divisors (see below), whose sum is σ = 2169302400. Its totient is φ = 2168388928.

The previous prime is 2168845661. The next prime is 2168845711. The reversal of 2168845663 is 3665488612.

It is a happy number.

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 2168845663 - 2¹ = 2168845661 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 (2168845661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221170 + ... + 230767.

It is an arithmetic number, because the mean of its divisors is an integer number (542325600).

Almost surely, 2^2168845663 is an apocalyptic number.

2168845663 is a deficient number, since it is larger than the sum of its proper divisors (456737).

2168845663 is an equidigital number, since it uses as much as digits as its factorization.

2168845663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456736.

The product of its digits is 1658880, while the sum is 49.

The square root of 2168845663 is about 46570.8671059494. The cubic root of 2168845663 is about 1294.4229850869.

The spelling of 2168845663 in words is "two billion, one hundred sixty-eight million, eight hundred forty-five thousand, six hundred sixty-three".