66443578648 has 16 divisors (see below), whose sum is σ = 124585134480. Its totient is φ = 33220876128.

The previous prime is 66443578627. The next prime is 66443578679. The reversal of 66443578648 is 84687534466.

It is a happy number.

It is a congruent number.

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, 271861 + ... + 454747.

It is an arithmetic number, because the mean of its divisors is an integer number (7786570905).

Almost surely, 2^66443578648 is an apocalyptic number.

It is an amenable number.

66443578648 is a deficient number, since it is larger than the sum of its proper divisors (58141555832).

66443578648 is a wasteful number, since it uses less digits than its factorization.

66443578648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228306 (or 228302 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 61.

The spelling of 66443578648 in words is "sixty-six billion, four hundred forty-three million, five hundred seventy-eight thousand, six hundred forty-eight".