66340009 has 4 divisors (see below), whose sum is σ = 67958100. Its totient is φ = 64721920.

The previous prime is 66340007. The next prime is 66340019. The reversal of 66340009 is 90004366.

66340009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90004366 = 2 ⋅45002183.

It can be written as a sum of positive squares in 2 ways, for example, as 1617984 + 64722025 = 1272^2 + 8045^2 .

It is a cyclic number.

It is not a de Polignac number, because 66340009 - 2¹ = 66340007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66340007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808984 + ... + 809065.

It is an arithmetic number, because the mean of its divisors is an integer number (16989525).

Almost surely, 2^66340009 is an apocalyptic number.

It is an amenable number.

66340009 is a deficient number, since it is larger than the sum of its proper divisors (1618091).

66340009 is a wasteful number, since it uses less digits than its factorization.

66340009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618090.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 66340009 is about 8144.9376302093. The cubic root of 66340009 is about 404.8167824421.

The spelling of 66340009 in words is "sixty-six million, three hundred forty thousand, nine".