6645300864 has 64 divisors (see below), whose sum is σ = 18221018880. Its totient is φ = 2143641600.

The previous prime is 6645300859. The next prime is 6645300889. The reversal of 6645300864 is 4680035466.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267217 + ... + 291024.

It is an arithmetic number, because the mean of its divisors is an integer number (284703420).

Almost surely, 2^6645300864 is an apocalyptic number.

6645300864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6645300864 is an abundant number, since it is smaller than the sum of its proper divisors (11575718016).

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

6645300864 is a wasteful number, since it uses less digits than its factorization.

6645300864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558289 (or 558277 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 6645300864 is about 81518.7148083187. The cubic root of 6645300864 is about 1880.0593070169.

The spelling of 6645300864 in words is "six billion, six hundred forty-five million, three hundred thousand, eight hundred sixty-four".