66003128657 has 2 divisors, whose sum is σ = 66003128658. Its totient is φ = 66003128656.

The previous prime is 66003128647. The next prime is 66003128669. The reversal of 66003128657 is 75682130066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63903289681 + 2099838976 = 252791^2 + 45824^2 .

It is a cyclic number.

It is not a de Polignac number, because 66003128657 - 2¹⁶ = 66003063121 is a prime.

It is not a weakly prime, because it can be changed into another prime (66003128627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33001564328 + 33001564329.

It is an arithmetic number, because the mean of its divisors is an integer number (33001564329).

Almost surely, 2^66003128657 is an apocalyptic number.

It is an amenable number.

66003128657 is a deficient number, since it is larger than the sum of its proper divisors (1).

66003128657 is an equidigital number, since it uses as much as digits as its factorization.

66003128657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 66003128657 in words is "sixty-six billion, three million, one hundred twenty-eight thousand, six hundred fifty-seven".