66661038404 has 12 divisors (see below), whose sum is σ = 116841697728. Its totient is φ = 33277696200.

The previous prime is 66661038397. The next prime is 66661038421. The reversal of 66661038404 is 40483016666.

66661038404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 13202912 + ... + 13207959.

It is an arithmetic number, because the mean of its divisors is an integer number (9736808144).

Almost surely, 2^66661038404 is an apocalyptic number.

It is an amenable number.

66661038404 is a deficient number, since it is larger than the sum of its proper divisors (50180659324).

66661038404 is a wasteful number, since it uses less digits than its factorization.

66661038404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26411506 (or 26411504 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 66661038404 in words is "sixty-six billion, six hundred sixty-one million, thirty-eight thousand, four hundred four".