66242849 has 2 divisors, whose sum is σ = 66242850. Its totient is φ = 66242848.

The previous prime is 66242831. The next prime is 66242851. The reversal of 66242849 is 94824266.

66242849 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., 48052624 + 18190225 = 6932^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 66242849 - 2¹⁶ = 66177313 is a prime.

Together with 66242851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66242809) 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, 33121424 + 33121425.

It is an arithmetic number, because the mean of its divisors is an integer number (33121425).

Almost surely, 2^66242849 is an apocalyptic number.

It is an amenable number.

66242849 is a deficient number, since it is larger than the sum of its proper divisors (1).

66242849 is an equidigital number, since it uses as much as digits as its factorization.

66242849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 41.

The square root of 66242849 is about 8138.9710037572. The cubic root of 66242849 is about 404.6190575378.

The spelling of 66242849 in words is "sixty-six million, two hundred forty-two thousand, eight hundred forty-nine".