18496816009 has 9 divisors (see below), whose sum is σ = 21517811847. Its totient is φ = 15853597704.

The previous prime is 18496816007. The next prime is 18496816033. The reversal of 18496816009 is 90061869481.

The square root of 18496816009 is 136003.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 93180409 + 18403635600 = 9653^2 + 135660^2 .

It is not a de Polignac number, because 18496816009 - 2¹ = 18496816007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18496816007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 942307 + ... + 961735.

It is an arithmetic number, because the mean of its divisors is an integer number (2390867983).

Almost surely, 2^18496816009 is an apocalyptic number.

18496816009 is the 136003-rd square number.

18496816009 is the 68002-nd centered octagonal number.

It is an amenable number.

18496816009 is a deficient number, since it is larger than the sum of its proper divisors (3020995838).

18496816009 is an frugal number, since it uses more digits than its factorization.

18496816009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38872 (or 19436 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 18496816009 in words is "eighteen billion, four hundred ninety-six million, eight hundred sixteen thousand, nine".