216640660411 has 4 divisors (see below), whose sum is σ = 247589326192. Its totient is φ = 185691994632.

The previous prime is 216640660387. The next prime is 216640660421. The reversal of 216640660411 is 114066046612.

216640660411 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216640660411 - 2⁹ = 216640659899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216640660421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15474332880 + ... + 15474332893.

It is an arithmetic number, because the mean of its divisors is an integer number (61897331548).

Almost surely, 2^216640660411 is an apocalyptic number.

216640660411 is a deficient number, since it is larger than the sum of its proper divisors (30948665781).

216640660411 is an equidigital number, since it uses as much as digits as its factorization.

216640660411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30948665780.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 216640660411 in words is "two hundred sixteen billion, six hundred forty million, six hundred sixty thousand, four hundred eleven".