66685207 has 2 divisors, whose sum is σ = 66685208. Its totient is φ = 66685206.

The previous prime is 66685189. The next prime is 66685249. The reversal of 66685207 is 70258666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66685207 - 2¹¹ = 66683159 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 66685207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66685277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33342603 + 33342604.

It is an arithmetic number, because the mean of its divisors is an integer number (33342604).

Almost surely, 2^66685207 is an apocalyptic number.

66685207 is a deficient number, since it is larger than the sum of its proper divisors (1).

66685207 is an equidigital number, since it uses as much as digits as its factorization.

66685207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 66685207 is about 8166.1010892592. The cubic root of 66685207 is about 405.5177182384.

The spelling of 66685207 in words is "sixty-six million, six hundred eighty-five thousand, two hundred seven".