66440211 has 4 divisors (see below), whose sum is σ = 88586952. Its totient is φ = 44293472.

The previous prime is 66440201. The next prime is 66440237. The reversal of 66440211 is 11204466.

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

It is a cyclic number.

It is not a de Polignac number, because 66440211 - 2⁹ = 66439699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66440201) 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, 11073366 + ... + 11073371.

It is an arithmetic number, because the mean of its divisors is an integer number (22146738).

Almost surely, 2^66440211 is an apocalyptic number.

66440211 is a deficient number, since it is larger than the sum of its proper divisors (22146741).

66440211 is a wasteful number, since it uses less digits than its factorization.

66440211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22146740.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 66440211 is about 8151.0864919960. The cubic root of 66440211 is about 405.0204958382.

Adding to 66440211 its reverse (11204466), we get a palindrome (77644677).

The spelling of 66440211 in words is "sixty-six million, four hundred forty thousand, two hundred eleven".