813786795173 has 4 divisors (see below), whose sum is σ = 887767412928. Its totient is φ = 739806177420.

The previous prime is 813786795127. The next prime is 813786795181. The reversal of 813786795173 is 371597687318.

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 a de Polignac number, because none of the positive numbers 2^k-813786795173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813786795193) 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, 36990308861 + ... + 36990308882.

It is an arithmetic number, because the mean of its divisors is an integer number (221941853232).

Almost surely, 2^813786795173 is an apocalyptic number.

It is an amenable number.

813786795173 is a deficient number, since it is larger than the sum of its proper divisors (73980617755).

813786795173 is a wasteful number, since it uses less digits than its factorization.

813786795173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73980617754.

The product of its digits is 53343360, while the sum is 65.

The spelling of 813786795173 in words is "eight hundred thirteen billion, seven hundred eighty-six million, seven hundred ninety-five thousand, one hundred seventy-three".