6647423305 has 4 divisors (see below), whose sum is σ = 7976907972. Its totient is φ = 5317938640.

The previous prime is 6647423303. The next prime is 6647423309. The reversal of 6647423305 is 5033247466.

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 3988680336 + 2658742969 = 63156^2 + 51563^2 .

It is not a de Polignac number, because 6647423305 - 2¹ = 6647423303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6647423303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664742326 + ... + 664742335.

It is an arithmetic number, because the mean of its divisors is an integer number (1994226993).

Almost surely, 2^6647423305 is an apocalyptic number.

It is an amenable number.

6647423305 is a deficient number, since it is larger than the sum of its proper divisors (1329484667).

6647423305 is a wasteful number, since it uses less digits than its factorization.

6647423305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329484666.

The product of its (nonzero) digits is 362880, while the sum is 40.

The square root of 6647423305 is about 81531.7318901052. The cubic root of 6647423305 is about 1880.2594429371.

The spelling of 6647423305 in words is "six billion, six hundred forty-seven million, four hundred twenty-three thousand, three hundred five".