6493440664 has 64 divisors (see below), whose sum is σ = 12787568640. Its totient is φ = 3088108800.

The previous prime is 6493440659. The next prime is 6493440713. The reversal of 6493440664 is 4660443946.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3604564 + ... + 3606364.

It is an arithmetic number, because the mean of its divisors is an integer number (199805760).

Almost surely, 2^6493440664 is an apocalyptic number.

It is an amenable number.

6493440664 is a deficient number, since it is larger than the sum of its proper divisors (6294127976).

6493440664 is a wasteful number, since it uses less digits than its factorization.

6493440664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120 (or 2116 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 46.

The square root of 6493440664 is about 80581.8879401569. The cubic root of 6493440664 is about 1865.6276031560.

The spelling of 6493440664 in words is "six billion, four hundred ninety-three million, four hundred forty thousand, six hundred sixty-four".