66120449 has 4 divisors (see below), whose sum is σ = 66463236. Its totient is φ = 65777664.

The previous prime is 66120433. The next prime is 66120473. The reversal of 66120449 is 94402166.

It is a happy number.

66120449 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 43983424 + 22137025 = 6632^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 66120449 - 2⁴ = 66120433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66120419) 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, 171104 + ... + 171489.

It is an arithmetic number, because the mean of its divisors is an integer number (16615809).

Almost surely, 2^66120449 is an apocalyptic number.

It is an amenable number.

66120449 is a deficient number, since it is larger than the sum of its proper divisors (342787).

66120449 is a wasteful number, since it uses less digits than its factorization.

66120449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342786.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 66120449 is about 8131.4481490077. The cubic root of 66120449 is about 404.3696927224.

The spelling of 66120449 in words is "sixty-six million, one hundred twenty thousand, four hundred forty-nine".