66281339 has 2 divisors, whose sum is σ = 66281340. Its totient is φ = 66281338.

The previous prime is 66281333. The next prime is 66281353. The reversal of 66281339 is 93318266.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66281339 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66281333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33140669 + 33140670.

It is an arithmetic number, because the mean of its divisors is an integer number (33140670).

Almost surely, 2^66281339 is an apocalyptic number.

66281339 is a deficient number, since it is larger than the sum of its proper divisors (1).

66281339 is an equidigital number, since it uses as much as digits as its factorization.

66281339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 66281339 is about 8141.3352099026. The cubic root of 66281339 is about 404.6974095028.

The spelling of 66281339 in words is "sixty-six million, two hundred eighty-one thousand, three hundred thirty-nine".