6464440194320 has 20 divisors (see below), whose sum is σ = 15029823451980. Its totient is φ = 2585776077696.

The previous prime is 6464440194301. The next prime is 6464440194323. The reversal of 6464440194320 is 234910444646.

It can be written as a sum of positive squares in 2 ways, for example, as 4830869909776 + 1633570284544 = 2197924^2 + 1278112^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (6464440194323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40402751135 + ... + 40402751294.

It is an arithmetic number, because the mean of its divisors is an integer number (751491172599).

Almost surely, 2^{6464440194320} is an apocalyptic number.

It is an amenable number.

6464440194320 is an abundant number, since it is smaller than the sum of its proper divisors (8565383257660).

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

6464440194320 is a wasteful number, since it uses less digits than its factorization.

6464440194320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80805502442 (or 80805502436 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 47.

The spelling of 6464440194320 in words is "six trillion, four hundred sixty-four billion, four hundred forty million, one hundred ninety-four thousand, three hundred twenty".