66241321 has 2 divisors, whose sum is σ = 66241322. Its totient is φ = 66241320.

The previous prime is 66241313. The next prime is 66241339. The reversal of 66241321 is 12314266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55711296 + 10530025 = 7464^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 66241321 - 2³ = 66241313 is a prime.

It is not a weakly prime, because it can be changed into another prime (66241381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33120660 + 33120661.

It is an arithmetic number, because the mean of its divisors is an integer number (33120661).

Almost surely, 2^66241321 is an apocalyptic number.

It is an amenable number.

66241321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66241321 is an equidigital number, since it uses as much as digits as its factorization.

66241321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 66241321 is about 8138.8771338558. The cubic root of 66241321 is about 404.6159464464.

Adding to 66241321 its reverse (12314266), we get a palindrome (78555587).

The spelling of 66241321 in words is "sixty-six million, two hundred forty-one thousand, three hundred twenty-one".