6644836333464 has 128 divisors (see below), whose sum is σ = 19639646208000. Its totient is φ = 1833347041920.

The previous prime is 6644836333459. The next prime is 6644836333507. The reversal of 6644836333464 is 4643336384466.

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 = 6644836333398 and 6644836333407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1066087 + ... + 3798185.

It is an arithmetic number, because the mean of its divisors is an integer number (153434736000).

Almost surely, 2^{6644836333464} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6644836333464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9819823104000).

6644836333464 is an abundant number, since it is smaller than the sum of its proper divisors (12994809874536).

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

6644836333464 is a wasteful number, since it uses less digits than its factorization.

6644836333464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732613 (or 2732609 counting only the distinct ones).

The product of its digits is 214990848, while the sum is 60.

The spelling of 6644836333464 in words is "six trillion, six hundred forty-four billion, eight hundred thirty-six million, three hundred thirty-three thousand, four hundred sixty-four".