66705347 has 2 divisors, whose sum is σ = 66705348. Its totient is φ = 66705346.

The previous prime is 66705277. The next prime is 66705377. The reversal of 66705347 is 74350766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66705347 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66705347.

It is not a weakly prime, because it can be changed into another prime (66705377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33352673 + 33352674.

It is an arithmetic number, because the mean of its divisors is an integer number (33352674).

Almost surely, 2^66705347 is an apocalyptic number.

66705347 is a deficient number, since it is larger than the sum of its proper divisors (1).

66705347 is an equidigital number, since it uses as much as digits as its factorization.

66705347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 66705347 is about 8167.3341427910. The cubic root of 66705347 is about 405.5585384100.

The spelling of 66705347 in words is "sixty-six million, seven hundred five thousand, three hundred forty-seven".