819381785323 has 4 divisors (see below), whose sum is σ = 819450255960. Its totient is φ = 819313314688.

The previous prime is 819381785317. The next prime is 819381785363. The reversal of 819381785323 is 323587183918.

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

It is a cyclic number.

It is not a de Polignac number, because 819381785323 - 2¹⁷ = 819381654251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819381785363) 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, 34217365 + ... + 34241302.

It is an arithmetic number, because the mean of its divisors is an integer number (204862563990).

Almost surely, 2^819381785323 is an apocalyptic number.

819381785323 is a deficient number, since it is larger than the sum of its proper divisors (68470637).

819381785323 is a wasteful number, since it uses less digits than its factorization.

819381785323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68470636.

The product of its digits is 8709120, while the sum is 58.

The spelling of 819381785323 in words is "eight hundred nineteen billion, three hundred eighty-one million, seven hundred eighty-five thousand, three hundred twenty-three".