66648393349 has 2 divisors, whose sum is σ = 66648393350. Its totient is φ = 66648393348.

The previous prime is 66648393341. The next prime is 66648393397. The reversal of 66648393349 is 94339384666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49219641025 + 17428752324 = 221855^2 + 132018^2 .

It is a cyclic number.

It is not a de Polignac number, because 66648393349 - 2³ = 66648393341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66648393341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33324196674 + 33324196675.

It is an arithmetic number, because the mean of its divisors is an integer number (33324196675).

Almost surely, 2^66648393349 is an apocalyptic number.

It is an amenable number.

66648393349 is a deficient number, since it is larger than the sum of its proper divisors (1).

66648393349 is an equidigital number, since it uses as much as digits as its factorization.

66648393349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60466176, while the sum is 61.

The spelling of 66648393349 in words is "sixty-six billion, six hundred forty-eight million, three hundred ninety-three thousand, three hundred forty-nine".