66611339 has 2 divisors, whose sum is σ = 66611340. Its totient is φ = 66611338.

The previous prime is 66611327. The next prime is 66611341. The reversal of 66611339 is 93311666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66611339 - 2⁴ = 66611323 is a prime.

It is a Sophie Germain prime.

Together with 66611341, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66611299 and 66611308.

It is not a weakly prime, because it can be changed into another prime (66611309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33305669 + 33305670.

It is an arithmetic number, because the mean of its divisors is an integer number (33305670).

Almost surely, 2^66611339 is an apocalyptic number.

66611339 is a deficient number, since it is larger than the sum of its proper divisors (1).

66611339 is an equidigital number, since it uses as much as digits as its factorization.

66611339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 35.

The square root of 66611339 is about 8161.5769922240. The cubic root of 66611339 is about 405.3679306448.

It can be divided in two parts, 6661 and 1339, that added together give a cube (8000 = 20³).

The spelling of 66611339 in words is "sixty-six million, six hundred eleven thousand, three hundred thirty-nine".