19953820109 has 2 divisors, whose sum is σ = 19953820110. Its totient is φ = 19953820108.

The previous prime is 19953820067. The next prime is 19953820123. The reversal of 19953820109 is 90102835991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14359228900 + 5594591209 = 119830^2 + 74797^2 .

It is a cyclic number.

It is not a de Polignac number, because 19953820109 - 2¹² = 19953816013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19953820409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9976910054 + 9976910055.

It is an arithmetic number, because the mean of its divisors is an integer number (9976910055).

Almost surely, 2^19953820109 is an apocalyptic number.

It is an amenable number.

19953820109 is a deficient number, since it is larger than the sum of its proper divisors (1).

19953820109 is an equidigital number, since it uses as much as digits as its factorization.

19953820109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 19953820109 in words is "nineteen billion, nine hundred fifty-three million, eight hundred twenty thousand, one hundred nine".