66434632321 has 2 divisors, whose sum is σ = 66434632322. Its totient is φ = 66434632320.

The previous prime is 66434632309. The next prime is 66434632351. The reversal of 66434632321 is 12323643466.

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., 52642713600 + 13791918721 = 229440^2 + 117439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66434632321 is a prime.

It is not a weakly prime, because it can be changed into another prime (66434632351) 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, 33217316160 + 33217316161.

It is an arithmetic number, because the mean of its divisors is an integer number (33217316161).

Almost surely, 2^66434632321 is an apocalyptic number.

It is an amenable number.

66434632321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66434632321 is an equidigital number, since it uses as much as digits as its factorization.

66434632321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 40.

The spelling of 66434632321 in words is "sixty-six billion, four hundred thirty-four million, six hundred thirty-two thousand, three hundred twenty-one".