19008785813 has 2 divisors, whose sum is σ = 19008785814. Its totient is φ = 19008785812.

The previous prime is 19008785801. The next prime is 19008785819. The reversal of 19008785813 is 31858780091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18720533329 + 288252484 = 136823^2 + 16978^2 .

It is a cyclic number.

It is not a de Polignac number, because 19008785813 - 2⁶ = 19008785749 is a prime.

It is a super-2 number, since 2×19008785813² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19008785819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9504392906 + 9504392907.

It is an arithmetic number, because the mean of its divisors is an integer number (9504392907).

Almost surely, 2^19008785813 is an apocalyptic number.

It is an amenable number.

19008785813 is a deficient number, since it is larger than the sum of its proper divisors (1).

19008785813 is an equidigital number, since it uses as much as digits as its factorization.

19008785813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 19008785813 in words is "nineteen billion, eight million, seven hundred eighty-five thousand, eight hundred thirteen".