66505462321 has 2 divisors, whose sum is σ = 66505462322. Its totient is φ = 66505462320.

The previous prime is 66505462277. The next prime is 66505462333. The reversal of 66505462321 is 12326450566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44531550625 + 21973911696 = 211025^2 + 148236^2 .

It is a cyclic number.

It is not a de Polignac number, because 66505462321 - 2²⁷ = 66371244593 is a prime.

It is not a weakly prime, because it can be changed into another prime (66505442321) 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, 33252731160 + 33252731161.

It is an arithmetic number, because the mean of its divisors is an integer number (33252731161).

Almost surely, 2^66505462321 is an apocalyptic number.

It is an amenable number.

66505462321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66505462321 is an equidigital number, since it uses as much as digits as its factorization.

66505462321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 66505462321 in words is "sixty-six billion, five hundred five million, four hundred sixty-two thousand, three hundred twenty-one".