6661065469 has 2 divisors, whose sum is σ = 6661065470. Its totient is φ = 6661065468.

The previous prime is 6661065431. The next prime is 6661065479. The reversal of 6661065469 is 9645601666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4982524569 + 1678540900 = 70587^2 + 40970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6661065469 is a prime.

It is a super-2 number, since 2×6661065469² = 88739586364608379922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6661065479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330532734 + 3330532735.

It is an arithmetic number, because the mean of its divisors is an integer number (3330532735).

Almost surely, 2^6661065469 is an apocalyptic number.

It is an amenable number.

6661065469 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661065469 is an equidigital number, since it uses as much as digits as its factorization.

6661065469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The square root of 6661065469 is about 81615.3506945844. The cubic root of 6661065469 is about 1881.5448171946.

The spelling of 6661065469 in words is "six billion, six hundred sixty-one million, sixty-five thousand, four hundred sixty-nine".