664583644044 has 72 divisors (see below), whose sum is σ = 1778974207920. Its totient is φ = 208469210112.

The previous prime is 664583644009. The next prime is 664583644079. The reversal of 664583644044 is 440446385466.

664583644044 is a `hidden beast` number, since 66 + 45 + 83 + 64 + 404 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (664583644009) and next prime (664583644079).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4823787 + ... + 4959645.

It is an arithmetic number, because the mean of its divisors is an integer number (24707975110).

Almost surely, 2^664583644044 is an apocalyptic number.

It is an amenable number.

664583644044 is an abundant number, since it is smaller than the sum of its proper divisors (1114390563876).

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

664583644044 is a wasteful number, since it uses less digits than its factorization.

664583644044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143879 (or 143874 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 54.

It can be divided in two parts, 6645836440 and 44, that added together give a square (6645836484 = 81522²).

The spelling of 664583644044 in words is "six hundred sixty-four billion, five hundred eighty-three million, six hundred forty-four thousand, forty-four".