66069449 has 4 divisors (see below), whose sum is σ = 66295236. Its totient is φ = 65843664.

The previous prime is 66069391. The next prime is 66069467. The reversal of 66069449 is 94496066.

It is a happy number.

66069449 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.

It can be written as a sum of positive squares in 2 ways, for example, as 63313849 + 2755600 = 7957^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 66069449 - 2⁸ = 66069193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66069469) 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, 112454 + ... + 113039.

It is an arithmetic number, because the mean of its divisors is an integer number (16573809).

Almost surely, 2^66069449 is an apocalyptic number.

It is an amenable number.

66069449 is a deficient number, since it is larger than the sum of its proper divisors (225787).

66069449 is a wasteful number, since it uses less digits than its factorization.

66069449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225786.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 66069449 is about 8128.3115712920. The cubic root of 66069449 is about 404.2656998872.

The spelling of 66069449 in words is "sixty-six million, sixty-nine thousand, four hundred forty-nine".