66683297608 has 8 divisors (see below), whose sum is σ = 125031183030. Its totient is φ = 33341648800.

The previous prime is 66683297581. The next prime is 66683297647. The reversal of 66683297608 is 80679238666.

66683297608 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 65955485124 + 727812484 = 256818^2 + 26978^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4167706093 + ... + 4167706108.

Almost surely, 2^66683297608 is an apocalyptic number.

It is an amenable number.

66683297608 is a deficient number, since it is larger than the sum of its proper divisors (58347885422).

66683297608 is a wasteful number, since it uses less digits than its factorization.

66683297608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8335412207 (or 8335412203 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 61.

The spelling of 66683297608 in words is "sixty-six billion, six hundred eighty-three million, two hundred ninety-seven thousand, six hundred eight".