66964091 has 2 divisors, whose sum is σ = 66964092. Its totient is φ = 66964090.

The previous prime is 66964087. The next prime is 66964127. The reversal of 66964091 is 19046966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66964091 - 2² = 66964087 is a prime.

It is not a weakly prime, because it can be changed into another prime (66964081) 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, 33482045 + 33482046.

It is an arithmetic number, because the mean of its divisors is an integer number (33482046).

Almost surely, 2^66964091 is an apocalyptic number.

66964091 is a deficient number, since it is larger than the sum of its proper divisors (1).

66964091 is an equidigital number, since it uses as much as digits as its factorization.

66964091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 66964091 is about 8183.1589866017. The cubic root of 66964091 is about 406.0822368136.

The spelling of 66964091 in words is "sixty-six million, nine hundred sixty-four thousand, ninety-one".