66605243 has 2 divisors, whose sum is σ = 66605244. Its totient is φ = 66605242.

The previous prime is 66605239. The next prime is 66605249. The reversal of 66605243 is 34250666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66605243 - 2² = 66605239 is a prime.

It is not a weakly prime, because it can be changed into another prime (66605249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33302621 + 33302622.

It is an arithmetic number, because the mean of its divisors is an integer number (33302622).

Almost surely, 2^66605243 is an apocalyptic number.

66605243 is a deficient number, since it is larger than the sum of its proper divisors (1).

66605243 is an equidigital number, since it uses as much as digits as its factorization.

66605243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 66605243 is about 8161.2035264414. The cubic root of 66605243 is about 405.3555643904.

The spelling of 66605243 in words is "sixty-six million, six hundred five thousand, two hundred forty-three".