6640211 has 4 divisors (see below), whose sum is σ = 6765552. Its totient is φ = 6514872.

The previous prime is 6640181. The next prime is 6640213. The reversal of 6640211 is 1120466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1120466 = 2 ⋅560233.

It is a cyclic number.

It is not a de Polignac number, because 6640211 - 2²² = 2445907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6640213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62591 + ... + 62696.

It is an arithmetic number, because the mean of its divisors is an integer number (1691388).

Almost surely, 2^6640211 is an apocalyptic number.

6640211 is a deficient number, since it is larger than the sum of its proper divisors (125341).

6640211 is a wasteful number, since it uses less digits than its factorization.

6640211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125340.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 6640211 is about 2576.8606869600. The cubic root of 6640211 is about 187.9579183766.

Adding to 6640211 its reverse (1120466), we get a palindrome (7760677).

The spelling of 6640211 in words is "six million, six hundred forty thousand, two hundred eleven".