6444644264664 has 64 divisors (see below), whose sum is σ = 16141941446400. Its totient is φ = 2144174043264.

The previous prime is 6444644264629. The next prime is 6444644264693. The reversal of 6444644264664 is 4664624464446.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 6444644264598 and 6444644264607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30633867 + ... + 30843525.

It is an arithmetic number, because the mean of its divisors is an integer number (252217835100).

Almost surely, 2^{6444644264664} is an apocalyptic number.

It is an amenable number.

6444644264664 is an abundant number, since it is smaller than the sum of its proper divisors (9697297181736).

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

6444644264664 is a wasteful number, since it uses less digits than its factorization.

6444644264664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212072 (or 212068 counting only the distinct ones).

The product of its digits is 254803968, while the sum is 60.

The spelling of 6444644264664 in words is "six trillion, four hundred forty-four billion, six hundred forty-four million, two hundred sixty-four thousand, six hundred sixty-four".