11823816217 has 4 divisors (see below), whose sum is σ = 12519334836. Its totient is φ = 11128297600.

The previous prime is 11823816203. The next prime is 11823816271. The reversal of 11823816217 is 71261832811.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3436187161 + 8387629056 = 58619^2 + 91584^2 .

It is a cyclic number.

It is not a de Polignac number, because 11823816217 - 2¹⁵ = 11823783449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11823816217.

It is not an unprimeable number, because it can be changed into a prime (11823816317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347759284 + ... + 347759317.

It is an arithmetic number, because the mean of its divisors is an integer number (3129833709).

Almost surely, 2^11823816217 is an apocalyptic number.

11823816217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11823816217 is a deficient number, since it is larger than the sum of its proper divisors (695518619).

11823816217 is an equidigital number, since it uses as much as digits as its factorization.

11823816217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695518618.

The product of its digits is 32256, while the sum is 40.

The spelling of 11823816217 in words is "eleven billion, eight hundred twenty-three million, eight hundred sixteen thousand, two hundred seventeen".