812328321643 has 4 divisors (see below), whose sum is σ = 812332090600. Its totient is φ = 812324552688.

The previous prime is 812328321529. The next prime is 812328321659. The reversal of 812328321643 is 346123823218.

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-812328321643 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 812328321643.

It is not an unprimeable number, because it can be changed into a prime (812328325643) 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, 1540218 + ... + 1999231.

It is an arithmetic number, because the mean of its divisors is an integer number (203083022650).

Almost surely, 2^812328321643 is an apocalyptic number.

812328321643 is a deficient number, since it is larger than the sum of its proper divisors (3768957).

812328321643 is a wasteful number, since it uses less digits than its factorization.

812328321643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3768956.

The product of its digits is 331776, while the sum is 43.

The spelling of 812328321643 in words is "eight hundred twelve billion, three hundred twenty-eight million, three hundred twenty-one thousand, six hundred forty-three".