6664436517 has 8 divisors (see below), whose sum is σ = 8894390400. Its totient is φ = 4438720160.

The previous prime is 6664436497. The next prime is 6664436521. The reversal of 6664436517 is 7156344666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6664436517 - 2¹⁸ = 6664174373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664436567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1055709 + ... + 1062002.

It is an arithmetic number, because the mean of its divisors is an integer number (1111798800).

Almost surely, 2^6664436517 is an apocalyptic number.

It is an amenable number.

6664436517 is a deficient number, since it is larger than the sum of its proper divisors (2229953883).

6664436517 is a wasteful number, since it uses less digits than its factorization.

6664436517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118763.

The product of its digits is 2177280, while the sum is 48.

The square root of 6664436517 is about 81636.0001286197. Note that the first 3 decimals coincide. The cubic root of 6664436517 is about 1881.8621692376.

The spelling of 6664436517 in words is "six billion, six hundred sixty-four million, four hundred thirty-six thousand, five hundred seventeen".