816648669 has 16 divisors (see below), whose sum is σ = 1281018240. Its totient is φ = 512406720.

The previous prime is 816648667. The next prime is 816648673. The reversal of 816648669 is 966846618.

816648669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 816648669 - 2¹ = 816648667 is a prime.

It is a super-2 number, since 2×816648669² = 1333830097158943122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816648661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 889137 + ... + 890054.

It is an arithmetic number, because the mean of its divisors is an integer number (80063640).

Almost surely, 2^816648669 is an apocalyptic number.

It is an amenable number.

816648669 is a deficient number, since it is larger than the sum of its proper divisors (464369571).

816648669 is a wasteful number, since it uses less digits than its factorization.

816648669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779217 (or 1779211 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 816648669 is about 28577.0654371648. The cubic root of 816648669 is about 934.7132940420.

The spelling of 816648669 in words is "eight hundred sixteen million, six hundred forty-eight thousand, six hundred sixty-nine".