2168440045 has 4 divisors (see below), whose sum is σ = 2602128060. Its totient is φ = 1734752032.

The previous prime is 2168440031. The next prime is 2168440051. The reversal of 2168440045 is 5400448612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1012576041 + 1155864004 = 31821^2 + 33998^2 .

It is a cyclic number.

It is not a de Polignac number, because 2168440045 - 2²⁷ = 2034222317 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 216844000 + ... + 216844009.

It is an arithmetic number, because the mean of its divisors is an integer number (650532015).

Almost surely, 2^2168440045 is an apocalyptic number.

It is an amenable number.

2168440045 is a deficient number, since it is larger than the sum of its proper divisors (433688015).

2168440045 is an equidigital number, since it uses as much as digits as its factorization.

2168440045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433688014.

The product of its (nonzero) digits is 30720, while the sum is 34.

The square root of 2168440045 is about 46566.5120553387. The cubic root of 2168440045 is about 1294.3422856307.

Adding to 2168440045 its reverse (5400448612), we get a palindrome (7568888657).

The spelling of 2168440045 in words is "two billion, one hundred sixty-eight million, four hundred forty thousand, forty-five".