16813530809 has 2 divisors, whose sum is σ = 16813530810. Its totient is φ = 16813530808.

The previous prime is 16813530743. The next prime is 16813530827. The reversal of 16813530809 is 90803531861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16728835600 + 84695209 = 129340^2 + 9203^2 .

It is a cyclic number.

It is not a de Polignac number, because 16813530809 - 2²⁰ = 16812482233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16813530809.

It is not a weakly prime, because it can be changed into another prime (16813530869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8406765404 + 8406765405.

It is an arithmetic number, because the mean of its divisors is an integer number (8406765405).

Almost surely, 2^16813530809 is an apocalyptic number.

It is an amenable number.

16813530809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16813530809 is an equidigital number, since it uses as much as digits as its factorization.

16813530809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 16813530809 in words is "sixteen billion, eight hundred thirteen million, five hundred thirty thousand, eight hundred nine".