6668189105 has 4 divisors (see below), whose sum is σ = 8001826932. Its totient is φ = 5334551280.

The previous prime is 6668189057. The next prime is 6668189107. The reversal of 6668189105 is 5019818666.

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 5214139681 + 1454049424 = 72209^2 + 38132^2 .

It is not a de Polignac number, because 6668189105 - 2¹⁶ = 6668123569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6668189107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666818906 + ... + 666818915.

It is an arithmetic number, because the mean of its divisors is an integer number (2000456733).

Almost surely, 2^6668189105 is an apocalyptic number.

It is an amenable number.

6668189105 is a deficient number, since it is larger than the sum of its proper divisors (1333637827).

6668189105 is a wasteful number, since it uses less digits than its factorization.

6668189105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333637826.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 6668189105 is about 81658.9805532741. The cubic root of 6668189105 is about 1882.2153137900.

The spelling of 6668189105 in words is "six billion, six hundred sixty-eight million, one hundred eighty-nine thousand, one hundred five".