805215318713 has 4 divisors (see below), whose sum is σ = 867154958628. Its totient is φ = 743275678800.

The previous prime is 805215318703. The next prime is 805215318727. The reversal of 805215318713 is 317813512508.

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 48155230249 + 757060088464 = 219443^2 + 870092^2 .

It is a cyclic number.

It is not a de Polignac number, because 805215318713 - 2¹⁰ = 805215317689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805215318703) 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, 30969819938 + ... + 30969819963.

It is an arithmetic number, because the mean of its divisors is an integer number (216788739657).

Almost surely, 2^805215318713 is an apocalyptic number.

It is an amenable number.

805215318713 is a deficient number, since it is larger than the sum of its proper divisors (61939639915).

805215318713 is a wasteful number, since it uses less digits than its factorization.

805215318713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61939639914.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 805215318713 in words is "eight hundred five billion, two hundred fifteen million, three hundred eighteen thousand, seven hundred thirteen".