66355441 has 2 divisors, whose sum is σ = 66355442. Its totient is φ = 66355440.

The previous prime is 66355439. The next prime is 66355447. The reversal of 66355441 is 14455366.

66355441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65674816 + 680625 = 8104^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 66355441 - 2¹ = 66355439 is a prime.

Together with 66355439, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 66355397 and 66355406.

It is not a weakly prime, because it can be changed into another prime (66355447) 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, 33177720 + 33177721.

It is an arithmetic number, because the mean of its divisors is an integer number (33177721).

Almost surely, 2^66355441 is an apocalyptic number.

It is an amenable number.

66355441 is a deficient number, since it is larger than the sum of its proper divisors (1).

66355441 is an equidigital number, since it uses as much as digits as its factorization.

66355441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 34.

The square root of 66355441 is about 8145.8849120277. The cubic root of 66355441 is about 404.8481694756.

The spelling of 66355441 in words is "sixty-six million, three hundred fifty-five thousand, four hundred forty-one".