66081481 has 2 divisors, whose sum is σ = 66081482. Its totient is φ = 66081480.

The previous prime is 66081479. The next prime is 66081493. The reversal of 66081481 is 18418066.

66081481 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., 37405456 + 28676025 = 6116^2 + 5355^2 .

It is a cyclic number.

It is not a de Polignac number, because 66081481 - 2¹ = 66081479 is a prime.

It is a super-2 number, since 2×66081481² = 8733524262306722, which contains 22 as substring.

Together with 66081479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66081581) 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, 33040740 + 33040741.

It is an arithmetic number, because the mean of its divisors is an integer number (33040741).

Almost surely, 2^66081481 is an apocalyptic number.

It is an amenable number.

66081481 is a deficient number, since it is larger than the sum of its proper divisors (1).

66081481 is an equidigital number, since it uses as much as digits as its factorization.

66081481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 66081481 is about 8129.0516667075. The cubic root of 66081481 is about 404.2902388621.

The spelling of 66081481 in words is "sixty-six million, eighty-one thousand, four hundred eighty-one".