666631305089 has 2 divisors, whose sum is σ = 666631305090. Its totient is φ = 666631305088.

The previous prime is 666631305071. The next prime is 666631305121. The reversal of 666631305089 is 980503136666.

666631305089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 655100840689 + 11530464400 = 809383^2 + 107380^2 .

It is a cyclic number.

It is not a de Polignac number, because 666631305089 - 2²⁸ = 666362869633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666631305089.

It is not a weakly prime, because it can be changed into another prime (666631302089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333315652544 + 333315652545.

It is an arithmetic number, because the mean of its divisors is an integer number (333315652545).

Almost surely, 2^666631305089 is an apocalyptic number.

It is an amenable number.

666631305089 is a deficient number, since it is larger than the sum of its proper divisors (1).

666631305089 is an equidigital number, since it uses as much as digits as its factorization.

666631305089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 53.

The spelling of 666631305089 in words is "six hundred sixty-six billion, six hundred thirty-one million, three hundred five thousand, eighty-nine".