660040211 has 8 divisors (see below), whose sum is σ = 673047648. Its totient is φ = 647136000.

The previous prime is 660040207. The next prime is 660040219. The reversal of 660040211 is 112040066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660040211 - 2² = 660040207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660040219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12830 + ... + 38531.

It is an arithmetic number, because the mean of its divisors is an integer number (84130956).

Almost surely, 2^660040211 is an apocalyptic number.

660040211 is a deficient number, since it is larger than the sum of its proper divisors (13007437).

660040211 is a wasteful number, since it uses less digits than its factorization.

660040211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51613.

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

The square root of 660040211 is about 25691.2477509365. The cubic root of 660040211 is about 870.6764506066.

Adding to 660040211 its reverse (112040066), we get a palindrome (772080277).

The spelling of 660040211 in words is "six hundred sixty million, forty thousand, two hundred eleven".