6640364564 has 12 divisors (see below), whose sum is σ = 11658492384. Its totient is φ = 3309366744.

The previous prime is 6640364561. The next prime is 6640364567. The reversal of 6640364564 is 4654630466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6640364561) and next prime (6640364567).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640364561) 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, 2702504 + ... + 2704959.

It is an arithmetic number, because the mean of its divisors is an integer number (971541032).

Almost surely, 2^6640364564 is an apocalyptic number.

It is an amenable number.

6640364564 is a deficient number, since it is larger than the sum of its proper divisors (5018127820).

6640364564 is a wasteful number, since it uses less digits than its factorization.

6640364564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5407774 (or 5407772 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 44.

The square root of 6640364564 is about 81488.4320870147. The cubic root of 6640364564 is about 1879.5936729378.

The spelling of 6640364564 in words is "six billion, six hundred forty million, three hundred sixty-four thousand, five hundred sixty-four".