816325665 has 16 divisors (see below), whose sum is σ = 1306637568. Its totient is φ = 435201536.

The previous prime is 816325613. The next prime is 816325681. The reversal of 816325665 is 566523618.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 816325665 - 2¹¹ = 816323617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34609 + ... + 53201.

It is an arithmetic number, because the mean of its divisors is an integer number (81664848).

Almost surely, 2^816325665 is an apocalyptic number.

It is an amenable number.

816325665 is a deficient number, since it is larger than the sum of its proper divisors (490311903).

816325665 is a wasteful number, since it uses less digits than its factorization.

816325665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21528.

The product of its digits is 259200, while the sum is 42.

The square root of 816325665 is about 28571.4134232103. The cubic root of 816325665 is about 934.5900440007.

The spelling of 816325665 in words is "eight hundred sixteen million, three hundred twenty-five thousand, six hundred sixty-five".