8216720411 has 4 divisors (see below), whose sum is σ = 8649179400. Its totient is φ = 7784261424.

The previous prime is 8216720383. The next prime is 8216720419. The reversal of 8216720411 is 1140276128.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8216720411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8216720419) 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, 216229466 + ... + 216229503.

It is an arithmetic number, because the mean of its divisors is an integer number (2162294850).

Almost surely, 2^8216720411 is an apocalyptic number.

8216720411 is a deficient number, since it is larger than the sum of its proper divisors (432458989).

8216720411 is a wasteful number, since it uses less digits than its factorization.

8216720411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432458988.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 8216720411 is about 90646.1273910805. The cubic root of 8216720411 is about 2017.8993627625.

Adding to 8216720411 its reverse (1140276128), we get a palindrome (9356996539).

The spelling of 8216720411 in words is "eight billion, two hundred sixteen million, seven hundred twenty thousand, four hundred eleven".