816309855 has 12 divisors (see below), whose sum is σ = 1414937160. Its totient is φ = 435365232.

The previous prime is 816309847. The next prime is 816309881. The reversal of 816309855 is 558903618.

816309855 is a `hidden beast` number, since 8 + 1 + 630 + 9 + 8 + 5 + 5 = 666.

It is not a de Polignac number, because 816309855 - 2³ = 816309847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 18140219 = 816309855 / (8 + 1 + 6 + 3 + 0 + 9 + 8 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 816309855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9070065 + ... + 9070154.

It is an arithmetic number, because the mean of its divisors is an integer number (117911430).

Almost surely, 2^816309855 is an apocalyptic number.

816309855 is a deficient number, since it is larger than the sum of its proper divisors (598627305).

816309855 is a wasteful number, since it uses less digits than its factorization.

816309855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18140230 (or 18140227 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 816309855 is about 28571.1367467240. The cubic root of 816309855 is about 934.5840104757.

The spelling of 816309855 in words is "eight hundred sixteen million, three hundred nine thousand, eight hundred fifty-five".