66012241 has 4 divisors (see below), whose sum is σ = 69895332. Its totient is φ = 62129152.

The previous prime is 66012223. The next prime is 66012257. The reversal of 66012241 is 14221066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53231616 + 12780625 = 7296^2 + 3575^2 .

It is not a de Polignac number, because 66012241 - 2¹³ = 66004049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66012641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1941520 + ... + 1941553.

It is an arithmetic number, because the mean of its divisors is an integer number (17473833).

Almost surely, 2^66012241 is an apocalyptic number.

It is an amenable number.

66012241 is a deficient number, since it is larger than the sum of its proper divisors (3883091).

66012241 is a wasteful number, since it uses less digits than its factorization.

66012241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3883090.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 66012241 is about 8124.7917511774. The cubic root of 66012241 is about 404.1489847698.

The spelling of 66012241 in words is "sixty-six million, twelve thousand, two hundred forty-one".