66347250565489 has 2 divisors, whose sum is σ = 66347250565490. Its totient is φ = 66347250565488.

The previous prime is 66347250565429. The next prime is 66347250565517. The reversal of 66347250565489 is 98456505274366.

66347250565489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47568609000000 + 18778641565489 = 6897000^2 + 4333433^2 .

It is a cyclic number.

It is not a de Polignac number, because 66347250565489 - 2⁷ = 66347250565361 is a prime.

It is not a weakly prime, because it can be changed into another prime (66347250565429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33173625282744 + 33173625282745.

It is an arithmetic number, because the mean of its divisors is an integer number (33173625282745).

Almost surely, 2^{66347250565489} is an apocalyptic number.

It is an amenable number.

66347250565489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66347250565489 is an equidigital number, since it uses as much as digits as its factorization.

66347250565489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368000, while the sum is 70.

The spelling of 66347250565489 in words is "sixty-six trillion, three hundred forty-seven billion, two hundred fifty million, five hundred sixty-five thousand, four hundred eighty-nine".