816317065 has 4 divisors (see below), whose sum is σ = 979580484. Its totient is φ = 653053648.

The previous prime is 816317063. The next prime is 816317071. The reversal of 816317065 is 560713618.

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 138391696 + 677925369 = 11764^2 + 26037^2 .

It is a cyclic number.

It is not a de Polignac number, because 816317065 - 2¹ = 816317063 is a prime.

It is a super-2 number, since 2×816317065² = 1332747101220428450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816317063) 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, 81631702 + ... + 81631711.

It is an arithmetic number, because the mean of its divisors is an integer number (244895121).

Almost surely, 2^816317065 is an apocalyptic number.

It is an amenable number.

816317065 is a deficient number, since it is larger than the sum of its proper divisors (163263419).

816317065 is a wasteful number, since it uses less digits than its factorization.

816317065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163263418.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 816317065 is about 28571.2629227341. The cubic root of 816317065 is about 934.5867620170.

The spelling of 816317065 in words is "eight hundred sixteen million, three hundred seventeen thousand, sixty-five".