66412249 has 2 divisors, whose sum is σ = 66412250. Its totient is φ = 66412248.

The previous prime is 66412243. The next prime is 66412267. The reversal of 66412249 is 94221466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36905625 + 29506624 = 6075^2 + 5432^2 .

It is a cyclic number.

It is not a de Polignac number, because 66412249 - 2¹⁹ = 65887961 is a prime.

It is not a weakly prime, because it can be changed into another prime (66412243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33206124 + 33206125.

It is an arithmetic number, because the mean of its divisors is an integer number (33206125).

Almost surely, 2^66412249 is an apocalyptic number.

It is an amenable number.

66412249 is a deficient number, since it is larger than the sum of its proper divisors (1).

66412249 is an equidigital number, since it uses as much as digits as its factorization.

66412249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 66412249 is about 8149.3710800282. The cubic root of 66412249 is about 404.9636689454.

The spelling of 66412249 in words is "sixty-six million, four hundred twelve thousand, two hundred forty-nine".