66289393 has 2 divisors, whose sum is σ = 66289394. Its totient is φ = 66289392.

The previous prime is 66289387. The next prime is 66289417. The reversal of 66289393 is 39398266.

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., 58798224 + 7491169 = 7668^2 + 2737^2 .

It is a cyclic number.

It is not a de Polignac number, because 66289393 - 2¹⁷ = 66158321 is a prime.

It is not a weakly prime, because it can be changed into another prime (66289313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33144696 + 33144697.

It is an arithmetic number, because the mean of its divisors is an integer number (33144697).

Almost surely, 2^66289393 is an apocalyptic number.

It is an amenable number.

66289393 is a deficient number, since it is larger than the sum of its proper divisors (1).

66289393 is an equidigital number, since it uses as much as digits as its factorization.

66289393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 46.

The square root of 66289393 is about 8141.8298311866. The cubic root of 66289393 is about 404.7138007474.

The spelling of 66289393 in words is "sixty-six million, two hundred eighty-nine thousand, three hundred ninety-three".