6816720311 has 8 divisors (see below), whose sum is σ = 6984345984. Its totient is φ = 6649159680.

The previous prime is 6816720283. The next prime is 6816720319. The reversal of 6816720311 is 1130276186.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6816720311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6816720319) 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, 247991 + ... + 274103.

It is an arithmetic number, because the mean of its divisors is an integer number (873043248).

Almost surely, 2^6816720311 is an apocalyptic number.

6816720311 is a deficient number, since it is larger than the sum of its proper divisors (167625673).

6816720311 is a wasteful number, since it uses less digits than its factorization.

6816720311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32521.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 6816720311 is about 82563.4320447012. The cubic root of 6816720311 is about 1896.0880092279.

Adding to 6816720311 its reverse (1130276186), we get a palindrome (7946996497).

The spelling of 6816720311 in words is "six billion, eight hundred sixteen million, seven hundred twenty thousand, three hundred eleven".