66728385337 has 2 divisors, whose sum is σ = 66728385338. Its totient is φ = 66728385336.

The previous prime is 66728385331. The next prime is 66728385413. The reversal of 66728385337 is 73358382766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52941868281 + 13786517056 = 230091^2 + 117416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66728385337 is a prime.

It is not a weakly prime, because it can be changed into another prime (66728385331) 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, 33364192668 + 33364192669.

It is an arithmetic number, because the mean of its divisors is an integer number (33364192669).

Almost surely, 2^66728385337 is an apocalyptic number.

It is an amenable number.

66728385337 is a deficient number, since it is larger than the sum of its proper divisors (1).

66728385337 is an equidigital number, since it uses as much as digits as its factorization.

66728385337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30481920, while the sum is 58.

The spelling of 66728385337 in words is "sixty-six billion, seven hundred twenty-eight million, three hundred eighty-five thousand, three hundred thirty-seven".