6644132664 has 64 divisors (see below), whose sum is σ = 18089114400. Its totient is φ = 2021369856.

The previous prime is 6644132657. The next prime is 6644132669. The reversal of 6644132664 is 4662314466.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644132669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91869 + ... + 147404.

Almost surely, 2^6644132664 is an apocalyptic number.

It is an amenable number.

6644132664 is an abundant number, since it is smaller than the sum of its proper divisors (11444981736).

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

6644132664 is a wasteful number, since it uses less digits than its factorization.

6644132664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239384 (or 239380 counting only the distinct ones).

The product of its digits is 497664, while the sum is 42.

The square root of 6644132664 is about 81511.5492675731. The cubic root of 6644132664 is about 1879.9491332246.

The spelling of 6644132664 in words is "six billion, six hundred forty-four million, one hundred thirty-two thousand, six hundred sixty-four".