66055666349 has 2 divisors, whose sum is σ = 66055666350. Its totient is φ = 66055666348.

The previous prime is 66055666343. The next prime is 66055666363. The reversal of 66055666349 is 94366655066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65121936100 + 933730249 = 255190^2 + 30557^2 .

It is a cyclic number.

It is not a de Polignac number, because 66055666349 - 2²⁰ = 66054617773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66055666294 and 66055666303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66055666343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33027833174 + 33027833175.

It is an arithmetic number, because the mean of its divisors is an integer number (33027833175).

Almost surely, 2^66055666349 is an apocalyptic number.

It is an amenable number.

66055666349 is a deficient number, since it is larger than the sum of its proper divisors (1).

66055666349 is an equidigital number, since it uses as much as digits as its factorization.

66055666349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20995200, while the sum is 56.

The spelling of 66055666349 in words is "sixty-six billion, fifty-five million, six hundred sixty-six thousand, three hundred forty-nine".