55666347329 has 2 divisors, whose sum is σ = 55666347330. Its totient is φ = 55666347328.

The previous prime is 55666347299. The next prime is 55666347361. The reversal of 55666347329 is 92374366655.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47864688400 + 7801658929 = 218780^2 + 88327^2 .

It is a cyclic number.

It is not a de Polignac number, because 55666347329 - 2²⁸ = 55397911873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55666347029) 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, 27833173664 + 27833173665.

It is an arithmetic number, because the mean of its divisors is an integer number (27833173665).

Almost surely, 2^55666347329 is an apocalyptic number.

It is an amenable number.

55666347329 is a deficient number, since it is larger than the sum of its proper divisors (1).

55666347329 is an equidigital number, since it uses as much as digits as its factorization.

55666347329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24494400, while the sum is 56.

The spelling of 55666347329 in words is "fifty-five billion, six hundred sixty-six million, three hundred forty-seven thousand, three hundred twenty-nine".