66404347 has 2 divisors, whose sum is σ = 66404348. Its totient is φ = 66404346.

The previous prime is 66404321. The next prime is 66404353. The reversal of 66404347 is 74340466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66404347 is a prime.

It is not a weakly prime, because it can be changed into another prime (66404647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33202173 + 33202174.

It is an arithmetic number, because the mean of its divisors is an integer number (33202174).

Almost surely, 2^66404347 is an apocalyptic number.

66404347 is a deficient number, since it is larger than the sum of its proper divisors (1).

66404347 is an equidigital number, since it uses as much as digits as its factorization.

66404347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 66404347 is about 8148.8862429169. The cubic root of 66404347 is about 404.9476068992.

The spelling of 66404347 in words is "sixty-six million, four hundred four thousand, three hundred forty-seven".