66005443 has 4 divisors (see below), whose sum is σ = 75434800. Its totient is φ = 56576088.

The previous prime is 66005389. The next prime is 66005453. The reversal of 66005443 is 34450066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66005443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66005453) 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, 4714668 + ... + 4714681.

It is an arithmetic number, because the mean of its divisors is an integer number (18858700).

Almost surely, 2^66005443 is an apocalyptic number.

66005443 is a deficient number, since it is larger than the sum of its proper divisors (9429357).

66005443 is an equidigital number, since it uses as much as digits as its factorization.

66005443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9429356.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 66005443 is about 8124.3733912222. The cubic root of 66005443 is about 404.1351110848.

The spelling of 66005443 in words is "sixty-six million, five thousand, four hundred forty-three".