6644064064 has 28 divisors (see below), whose sum is σ = 14382890208. Its totient is φ = 3020028800.

The previous prime is 6644064059. The next prime is 6644064079. The reversal of 6644064064 is 4604604466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4718092 + ... + 4719499.

Almost surely, 2^6644064064 is an apocalyptic number.

6644064064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6644064064 is an abundant number, since it is smaller than the sum of its proper divisors (7738826144).

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

6644064064 is a wasteful number, since it uses less digits than its factorization.

6644064064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9437614 (or 9437604 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The square root of 6644064064 is about 81511.1284672222. The cubic root of 6644064064 is about 1879.9426631072.

The spelling of 6644064064 in words is "six billion, six hundred forty-four million, sixty-four thousand, sixty-four".