66277273 has 2 divisors, whose sum is σ = 66277274. Its totient is φ = 66277272.

The previous prime is 66277261. The next prime is 66277297. The reversal of 66277273 is 37277266.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44262409 + 22014864 = 6653^2 + 4692^2 .

It is a cyclic number.

It is not a de Polignac number, because 66277273 - 2¹³ = 66269081 is a prime.

It is not a weakly prime, because it can be changed into another prime (66277873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33138636 + 33138637.

It is an arithmetic number, because the mean of its divisors is an integer number (33138637).

Almost surely, 2^66277273 is an apocalyptic number.

It is an amenable number.

66277273 is a deficient number, since it is larger than the sum of its proper divisors (1).

66277273 is an equidigital number, since it uses as much as digits as its factorization.

66277273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 40.

The square root of 66277273 is about 8141.0854927338. The cubic root of 66277273 is about 404.6891340045.

The spelling of 66277273 in words is "sixty-six million, two hundred seventy-seven thousand, two hundred seventy-three".