6464664646 has 16 divisors (see below), whose sum is σ = 10580033088. Its totient is φ = 2938069800.

The previous prime is 6464664643. The next prime is 6464664653.

It is a happy number.

6464664646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6464664593 and 6464664602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6464664641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183841 + ... + 216163.

It is an arithmetic number, because the mean of its divisors is an integer number (661252068).

Almost surely, 2^6464664646 is an apocalyptic number.

6464664646 is a deficient number, since it is larger than the sum of its proper divisors (4115368442).

6464664646 is a wasteful number, since it uses less digits than its factorization.

6464664646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41427.

The product of its digits is 11943936, while the sum is 52.

The square root of 6464664646 is about 80403.1382845222. The cubic root of 6464664646 is about 1862.8676471120.

The spelling of 6464664646 in words is "six billion, four hundred sixty-four million, six hundred sixty-four thousand, six hundred forty-six".