66446443 has 4 divisors (see below), whose sum is σ = 75938800. Its totient is φ = 56954088.

The previous prime is 66446441. The next prime is 66446447. The reversal of 66446443 is 34464466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34464466 = 2 ⋅17232233.

It is a cyclic number.

It is not a de Polignac number, because 66446443 - 2¹ = 66446441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66446441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4746168 + ... + 4746181.

It is an arithmetic number, because the mean of its divisors is an integer number (18984700).

Almost surely, 2^66446443 is an apocalyptic number.

66446443 is a deficient number, since it is larger than the sum of its proper divisors (9492357).

66446443 is an equidigital number, since it uses as much as digits as its factorization.

66446443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492356.

The product of its digits is 165888, while the sum is 37.

The square root of 66446443 is about 8151.4687633579. The cubic root of 66446443 is about 405.0331588966.

The spelling of 66446443 in words is "sixty-six million, four hundred forty-six thousand, four hundred forty-three".