66727217 has 2 divisors, whose sum is σ = 66727218. Its totient is φ = 66727216.

The previous prime is 66727207. The next prime is 66727247. The reversal of 66727217 is 71272766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47004736 + 19722481 = 6856^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 66727217 - 2⁴ = 66727201 is a prime.

It is not a weakly prime, because it can be changed into another prime (66727207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33363608 + 33363609.

It is an arithmetic number, because the mean of its divisors is an integer number (33363609).

Almost surely, 2^66727217 is an apocalyptic number.

It is an amenable number.

66727217 is a deficient number, since it is larger than the sum of its proper divisors (1).

66727217 is an equidigital number, since it uses as much as digits as its factorization.

66727217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 38.

The square root of 66727217 is about 8168.6729032322. The cubic root of 66727217 is about 405.6028556773.

The spelling of 66727217 in words is "sixty-six million, seven hundred twenty-seven thousand, two hundred seventeen".