66385441 has 4 divisors (see below), whose sum is σ = 66408084. Its totient is φ = 66362800.

The previous prime is 66385433. The next prime is 66385447. The reversal of 66385441 is 14458366.

It is a happy number.

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 31528225 + 34857216 = 5615^2 + 5904^2 .

It is a cyclic number.

It is not a de Polignac number, because 66385441 - 2³ = 66385433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66385441.

It is not an unprimeable number, because it can be changed into a prime (66385447) 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, 6130 + ... + 13051.

It is an arithmetic number, because the mean of its divisors is an integer number (16602021).

Almost surely, 2^66385441 is an apocalyptic number.

It is an amenable number.

66385441 is a deficient number, since it is larger than the sum of its proper divisors (22643).

66385441 is a wasteful number, since it uses less digits than its factorization.

66385441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22642.

The product of its digits is 69120, while the sum is 37.

The square root of 66385441 is about 8147.7261245086. The cubic root of 66385441 is about 404.9091723363.

The spelling of 66385441 in words is "sixty-six million, three hundred eighty-five thousand, four hundred forty-one".