818784676321 has 4 divisors (see below), whose sum is σ = 818786545200. Its totient is φ = 818782807444.

The previous prime is 818784676309. The next prime is 818784676363. The reversal of 818784676321 is 123676487818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 818784676321 - 2⁹ = 818784675809 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 818784676321.

It is not an unprimeable number, because it can be changed into a prime (818784671321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117390 + ... + 1285048.

It is an arithmetic number, because the mean of its divisors is an integer number (204696636300).

Almost surely, 2^818784676321 is an apocalyptic number.

It is an amenable number.

818784676321 is a deficient number, since it is larger than the sum of its proper divisors (1868879).

818784676321 is a wasteful number, since it uses less digits than its factorization.

818784676321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868878.

The product of its digits is 21676032, while the sum is 61.

The spelling of 818784676321 in words is "eight hundred eighteen billion, seven hundred eighty-four million, six hundred seventy-six thousand, three hundred twenty-one".