66685249 has 2 divisors, whose sum is σ = 66685250. Its totient is φ = 66685248.

The previous prime is 66685207. The next prime is 66685253. The reversal of 66685249 is 94258666.

66685249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41835024 + 24850225 = 6468^2 + 4985^2 .

It is a cyclic number.

It is not a de Polignac number, because 66685249 - 2¹³ = 66677057 is a prime.

It is a super-3 number, since 3×66685249³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66685199 and 66685208.

It is not a weakly prime, because it can be changed into another prime (66685049) 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 as a sum of consecutive naturals, namely, 33342624 + 33342625.

It is an arithmetic number, because the mean of its divisors is an integer number (33342625).

Almost surely, 2^66685249 is an apocalyptic number.

It is an amenable number.

66685249 is a deficient number, since it is larger than the sum of its proper divisors (1).

66685249 is an equidigital number, since it uses as much as digits as its factorization.

66685249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 46.

The square root of 66685249 is about 8166.1036608654. The cubic root of 66685249 is about 405.5178033734.

The spelling of 66685249 in words is "sixty-six million, six hundred eighty-five thousand, two hundred forty-nine".