66165665603 has 2 divisors, whose sum is σ = 66165665604. Its totient is φ = 66165665602.

The previous prime is 66165665567. The next prime is 66165665653. The reversal of 66165665603 is 30656656166.

It is an a-pointer prime, because the next prime (66165665653) can be obtained adding 66165665603 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66165665603 - 2³⁰ = 65091923779 is a prime.

It is not a weakly prime, because it can be changed into another prime (66165665653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082832801 + 33082832802.

It is an arithmetic number, because the mean of its divisors is an integer number (33082832802).

Almost surely, 2^66165665603 is an apocalyptic number.

66165665603 is a deficient number, since it is larger than the sum of its proper divisors (1).

66165665603 is an equidigital number, since it uses as much as digits as its factorization.

66165665603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3499200, while the sum is 50.

The spelling of 66165665603 in words is "sixty-six billion, one hundred sixty-five million, six hundred sixty-five thousand, six hundred three".