66704191 has 2 divisors, whose sum is σ = 66704192. Its totient is φ = 66704190.

The previous prime is 66704179. The next prime is 66704201. The reversal of 66704191 is 19140766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66704191 - 2⁵ = 66704159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66704101) 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, 33352095 + 33352096.

It is an arithmetic number, because the mean of its divisors is an integer number (33352096).

Almost surely, 2^66704191 is an apocalyptic number.

66704191 is a deficient number, since it is larger than the sum of its proper divisors (1).

66704191 is an equidigital number, since it uses as much as digits as its factorization.

66704191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 66704191 is about 8167.2633727583. The cubic root of 66704191 is about 405.5561956274.

The spelling of 66704191 in words is "sixty-six million, seven hundred four thousand, one hundred ninety-one".