66241787 has 2 divisors, whose sum is σ = 66241788. Its totient is φ = 66241786.

The previous prime is 66241783. The next prime is 66241789. The reversal of 66241787 is 78714266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66241787 - 2² = 66241783 is a prime.

Together with 66241789, 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 (66241781) 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, 33120893 + 33120894.

It is an arithmetic number, because the mean of its divisors is an integer number (33120894).

Almost surely, 2^66241787 is an apocalyptic number.

66241787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66241787 is an equidigital number, since it uses as much as digits as its factorization.

66241787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 41.

The square root of 66241787 is about 8138.9057618331. The cubic root of 66241787 is about 404.6168952529.

The spelling of 66241787 in words is "sixty-six million, two hundred forty-one thousand, seven hundred eighty-seven".