66447307 has 2 divisors, whose sum is σ = 66447308. Its totient is φ = 66447306.

The previous prime is 66447287. The next prime is 66447349. The reversal of 66447307 is 70374466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66447307 - 2¹¹ = 66445259 is a prime.

It is not a weakly prime, because it can be changed into another prime (66547307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33223653 + 33223654.

It is an arithmetic number, because the mean of its divisors is an integer number (33223654).

Almost surely, 2^66447307 is an apocalyptic number.

66447307 is a deficient number, since it is larger than the sum of its proper divisors (1).

66447307 is an equidigital number, since it uses as much as digits as its factorization.

66447307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 66447307 is about 8151.5217597698. The cubic root of 66447307 is about 405.0349144314.

The spelling of 66447307 in words is "sixty-six million, four hundred forty-seven thousand, three hundred seven".