66640444324 has 12 divisors (see below), whose sum is σ = 120642183900. Its totient is φ = 32171248928.

The previous prime is 66640444319. The next prime is 66640444357. The reversal of 66640444324 is 42344404666.

It can be written as a sum of positive squares in 2 ways, for example, as 18832621824 + 47807822500 = 137232^2 + 218650^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287243179 + ... + 287243410.

It is an arithmetic number, because the mean of its divisors is an integer number (10053515325).

Almost surely, 2^66640444324 is an apocalyptic number.

It is an amenable number.

66640444324 is a deficient number, since it is larger than the sum of its proper divisors (54001739576).

66640444324 is a wasteful number, since it uses less digits than its factorization.

66640444324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574486622 (or 574486620 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 43.

The spelling of 66640444324 in words is "sixty-six billion, six hundred forty million, four hundred forty-four thousand, three hundred twenty-four".