66440604044 has 12 divisors (see below), whose sum is σ = 116350109568. Its totient is φ = 33197715600.

The previous prime is 66440603993. The next prime is 66440604067. The reversal of 66440604044 is 44040604466.

It is a happy number.

66440604044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 66440603989 and 66440604007.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5639987 + ... + 5651754.

It is an arithmetic number, because the mean of its divisors is an integer number (9695842464).

Almost surely, 2^66440604044 is an apocalyptic number.

It is an amenable number.

66440604044 is a deficient number, since it is larger than the sum of its proper divisors (49909505524).

66440604044 is a wasteful number, since it uses less digits than its factorization.

66440604044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11293216 (or 11293214 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 38.

The spelling of 66440604044 in words is "sixty-six billion, four hundred forty million, six hundred four thousand, forty-four".