66307273 has 4 divisors (see below), whose sum is σ = 66651028. Its totient is φ = 65963520.

The previous prime is 66307261. The next prime is 66307279. The reversal of 66307273 is 37270366.

It is a happy number.

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 32353344 + 33953929 = 5688^2 + 5827^2 .

It is a cyclic number.

It is not a de Polignac number, because 66307273 - 2⁹ = 66306761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66307279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171588 + ... + 171973.

It is an arithmetic number, because the mean of its divisors is an integer number (16662757).

Almost surely, 2^66307273 is an apocalyptic number.

It is an amenable number.

66307273 is a deficient number, since it is larger than the sum of its proper divisors (343755).

66307273 is a wasteful number, since it uses less digits than its factorization.

66307273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343754.

The product of its (nonzero) digits is 31752, while the sum is 34.

The square root of 66307273 is about 8142.9277904203. The cubic root of 66307273 is about 404.7501848099.

The spelling of 66307273 in words is "sixty-six million, three hundred seven thousand, two hundred seventy-three".