6651005664 has 24 divisors (see below), whose sum is σ = 17458890120. Its totient is φ = 2217001856.

The previous prime is 6651005623. The next prime is 6651005671. The reversal of 6651005664 is 4665001566.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34640559 + ... + 34640750.

It is an arithmetic number, because the mean of its divisors is an integer number (727453755).

Almost surely, 2^6651005664 is an apocalyptic number.

It is an amenable number.

6651005664 is an abundant number, since it is smaller than the sum of its proper divisors (10807884456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6651005664 is a wasteful number, since it uses less digits than its factorization.

6651005664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69281322 (or 69281314 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 6651005664 is about 81553.6980400031. The cubic root of 6651005664 is about 1880.5971454524.

The spelling of 6651005664 in words is "six billion, six hundred fifty-one million, five thousand, six hundred sixty-four".