16691226593 has 2 divisors, whose sum is σ = 16691226594. Its totient is φ = 16691226592.

The previous prime is 16691226557. The next prime is 16691226679. The reversal of 16691226593 is 39562219661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16577335009 + 113891584 = 128753^2 + 10672^2 .

It is a cyclic number.

It is not a de Polignac number, because 16691226593 - 2¹⁰ = 16691225569 is a prime.

It is not a weakly prime, because it can be changed into another prime (16691222593) 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, 8345613296 + 8345613297.

It is an arithmetic number, because the mean of its divisors is an integer number (8345613297).

Almost surely, 2^16691226593 is an apocalyptic number.

It is an amenable number.

16691226593 is a deficient number, since it is larger than the sum of its proper divisors (1).

16691226593 is an equidigital number, since it uses as much as digits as its factorization.

16691226593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 50.

The spelling of 16691226593 in words is "sixteen billion, six hundred ninety-one million, two hundred twenty-six thousand, five hundred ninety-three".