66931273 has 2 divisors, whose sum is σ = 66931274. Its totient is φ = 66931272.

The previous prime is 66931259. The next prime is 66931279. The reversal of 66931273 is 37213966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38340864 + 28590409 = 6192^2 + 5347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66931273 is a prime.

It is not a weakly prime, because it can be changed into another prime (66931279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33465636 + 33465637.

It is an arithmetic number, because the mean of its divisors is an integer number (33465637).

Almost surely, 2^66931273 is an apocalyptic number.

It is an amenable number.

66931273 is a deficient number, since it is larger than the sum of its proper divisors (1).

66931273 is an equidigital number, since it uses as much as digits as its factorization.

66931273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 37.

The square root of 66931273 is about 8181.1535250232. The cubic root of 66931273 is about 406.0158878978.

The spelling of 66931273 in words is "sixty-six million, nine hundred thirty-one thousand, two hundred seventy-three".