6464640516 has 24 divisors (see below), whose sum is σ = 15129741984. Its totient is φ = 2148368640.

The previous prime is 6464640467. The next prime is 6464640517. The reversal of 6464640516 is 6150464646.

It is a super-2 number, since 2×6464640516² = 83583154002217492512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6464640517) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 809805 + ... + 817748.

It is an arithmetic number, because the mean of its divisors is an integer number (630405916).

Almost surely, 2^6464640516 is an apocalyptic number.

It is an amenable number.

6464640516 is an abundant number, since it is smaller than the sum of its proper divisors (8665101468).

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

6464640516 is a wasteful number, since it uses less digits than its factorization.

6464640516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627891 (or 1627889 counting only the distinct ones).

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

The square root of 6464640516 is about 80402.9882280503. The cubic root of 6464640516 is about 1862.8653293299.

The spelling of 6464640516 in words is "six billion, four hundred sixty-four million, six hundred forty thousand, five hundred sixteen".