66284839 has 2 divisors, whose sum is σ = 66284840. Its totient is φ = 66284838.

The previous prime is 66284773. The next prime is 66284843. The reversal of 66284839 is 93848266.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66284839 - 2⁹ = 66284327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66284849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33142419 + 33142420.

It is an arithmetic number, because the mean of its divisors is an integer number (33142420).

Almost surely, 2^66284839 is an apocalyptic number.

66284839 is a deficient number, since it is larger than the sum of its proper divisors (1).

66284839 is an equidigital number, since it uses as much as digits as its factorization.

66284839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 46.

The square root of 66284839 is about 8141.5501595212. The cubic root of 66284839 is about 404.7045327546.

The spelling of 66284839 in words is "sixty-six million, two hundred eighty-four thousand, eight hundred thirty-nine".