19926368909 has 2 divisors, whose sum is σ = 19926368910. Its totient is φ = 19926368908.

The previous prime is 19926368863. The next prime is 19926368911. The reversal of 19926368909 is 90986362991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12482475625 + 7443893284 = 111725^2 + 86278^2 .

It is a cyclic number.

It is not a de Polignac number, because 19926368909 - 2⁸ = 19926368653 is a prime.

Together with 19926368911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19926365909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9963184454 + 9963184455.

It is an arithmetic number, because the mean of its divisors is an integer number (9963184455).

Almost surely, 2^19926368909 is an apocalyptic number.

It is an amenable number.

19926368909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19926368909 is an equidigital number, since it uses as much as digits as its factorization.

19926368909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11337408, while the sum is 62.

The spelling of 19926368909 in words is "nineteen billion, nine hundred twenty-six million, three hundred sixty-eight thousand, nine hundred nine".