8247616816321 has 4 divisors (see below), whose sum is σ = 8249513260500. Its totient is φ = 8245720372144.

The previous prime is 8247616816303. The next prime is 8247616816349. The reversal of 8247616816321 is 1236186167428.

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 1842971868721 + 6404644947600 = 1357561^2 + 2530740^2 .

It is a cyclic number.

It is not a de Polignac number, because 8247616816321 - 2¹³ = 8247616808129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8247616816121) 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, 948215566 + ... + 948224263.

It is an arithmetic number, because the mean of its divisors is an integer number (2062378315125).

Almost surely, 2^{8247616816321} is an apocalyptic number.

It is an amenable number.

8247616816321 is a deficient number, since it is larger than the sum of its proper divisors (1896444179).

8247616816321 is a wasteful number, since it uses less digits than its factorization.

8247616816321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896444178.

The product of its digits is 4644864, while the sum is 55.

The spelling of 8247616816321 in words is "eight trillion, two hundred forty-seven billion, six hundred sixteen million, eight hundred sixteen thousand, three hundred twenty-one".