16591997813 has 2 divisors, whose sum is σ = 16591997814. Its totient is φ = 16591997812.

The previous prime is 16591997797. The next prime is 16591997833. The reversal of 16591997813 is 31879919561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16588924804 + 3073009 = 128798^2 + 1753^2 .

It is a cyclic number.

It is not a de Polignac number, because 16591997813 - 2⁴ = 16591997797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16591997833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8295998906 + 8295998907.

It is an arithmetic number, because the mean of its divisors is an integer number (8295998907).

Almost surely, 2^16591997813 is an apocalyptic number.

It is an amenable number.

16591997813 is a deficient number, since it is larger than the sum of its proper divisors (1).

16591997813 is an equidigital number, since it uses as much as digits as its factorization.

16591997813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 59.

The spelling of 16591997813 in words is "sixteen billion, five hundred ninety-one million, nine hundred ninety-seven thousand, eight hundred thirteen".