6644681335 has 4 divisors (see below), whose sum is σ = 7973617608. Its totient is φ = 5315745064.

The previous prime is 6644681333. The next prime is 6644681341. The reversal of 6644681335 is 5331864466.

6644681335 is nontrivially palindromic in base 9.

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 6644681335 - 2¹ = 6644681333 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 (6644681333) 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, 664468129 + ... + 664468138.

It is an arithmetic number, because the mean of its divisors is an integer number (1993404402).

Almost surely, 2^6644681335 is an apocalyptic number.

6644681335 is a deficient number, since it is larger than the sum of its proper divisors (1328936273).

6644681335 is a wasteful number, since it uses less digits than its factorization.

6644681335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328936272.

The product of its digits is 1244160, while the sum is 46.

The square root of 6644681335 is about 81514.9148009124. The cubic root of 6644681335 is about 1880.0008803942. Note that the first 3 decimals are identical.

The spelling of 6644681335 in words is "six billion, six hundred forty-four million, six hundred eighty-one thousand, three hundred thirty-five".