66884441 has 4 divisors (see below), whose sum is σ = 72029412. Its totient is φ = 61739472.

The previous prime is 66884401. The next prime is 66884449. The reversal of 66884441 is 14448866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14448866 = 2 ⋅7224433.

It can be written as a sum of positive squares in 2 ways, for example, as 43507216 + 23377225 = 6596^2 + 4835^2 .

It is a cyclic number.

It is not a de Polignac number, because 66884441 - 2¹⁴ = 66868057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66884449) 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, 2572466 + ... + 2572491.

It is an arithmetic number, because the mean of its divisors is an integer number (18007353).

Almost surely, 2^66884441 is an apocalyptic number.

It is an amenable number.

66884441 is a deficient number, since it is larger than the sum of its proper divisors (5144971).

66884441 is a wasteful number, since it uses less digits than its factorization.

66884441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144970.

The product of its digits is 147456, while the sum is 41.

The square root of 66884441 is about 8178.2908361100. The cubic root of 66884441 is about 405.9211689830.

The spelling of 66884441 in words is "sixty-six million, eight hundred eighty-four thousand, four hundred forty-one".