6644306660 has 48 divisors (see below), whose sum is σ = 14527788912. Its totient is φ = 2550374400.

The previous prime is 6644306651. The next prime is 6644306671. The reversal of 6644306660 is 666034466.

It can be written as a sum of positive squares in 8 ways, for example, as 4746658816 + 1897647844 = 68896^2 + 43562^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16397 + ... + 116436.

It is an arithmetic number, because the mean of its divisors is an integer number (302662269).

Almost surely, 2^6644306660 is an apocalyptic number.

It is an amenable number.

6644306660 is an abundant number, since it is smaller than the sum of its proper divisors (7883482252).

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

6644306660 is a wasteful number, since it uses less digits than its factorization.

6644306660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132944 (or 132942 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 41.

The square root of 6644306660 is about 81512.6165694612. The cubic root of 6644306660 is about 1879.9655437325.

The spelling of 6644306660 in words is "six billion, six hundred forty-four million, three hundred six thousand, six hundred sixty".