66361249 has 2 divisors, whose sum is σ = 66361250. Its totient is φ = 66361248.

The previous prime is 66361237. The next prime is 66361283. The reversal of 66361249 is 94216366.

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., 56325025 + 10036224 = 7505^2 + 3168^2 .

It is a cyclic number.

It is not a de Polignac number, because 66361249 - 2⁷ = 66361121 is a prime.

It is not a weakly prime, because it can be changed into another prime (66361349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33180624 + 33180625.

It is an arithmetic number, because the mean of its divisors is an integer number (33180625).

Almost surely, 2^66361249 is an apocalyptic number.

It is an amenable number.

66361249 is a deficient number, since it is larger than the sum of its proper divisors (1).

66361249 is an equidigital number, since it uses as much as digits as its factorization.

66361249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 66361249 is about 8146.2414032485. The cubic root of 66361249 is about 404.8599810645.

The spelling of 66361249 in words is "sixty-six million, three hundred sixty-one thousand, two hundred forty-nine".