66225541 has 2 divisors, whose sum is σ = 66225542. Its totient is φ = 66225540.

The previous prime is 66225539. The next prime is 66225581. The reversal of 66225541 is 14552266.

66225541 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., 60000516 + 6225025 = 7746^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 66225541 - 2¹ = 66225539 is a prime.

Together with 66225539, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66225581) 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, 33112770 + 33112771.

It is an arithmetic number, because the mean of its divisors is an integer number (33112771).

Almost surely, 2^66225541 is an apocalyptic number.

It is an amenable number.

66225541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66225541 is an equidigital number, since it uses as much as digits as its factorization.

66225541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 66225541 is about 8137.9076549197. The cubic root of 66225541 is about 404.5838147065.

It can be divided in two parts, 66225 and 541, that added together give a palindrome (66766).

The spelling of 66225541 in words is "sixty-six million, two hundred twenty-five thousand, five hundred forty-one".