19952560909 has 2 divisors, whose sum is σ = 19952560910. Its totient is φ = 19952560908.

The previous prime is 19952560891. The next prime is 19952560921. The reversal of 19952560909 is 90906525991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19497933225 + 454627684 = 139635^2 + 21322^2 .

It is a cyclic number.

It is not a de Polignac number, because 19952560909 - 2¹³ = 19952552717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19952560909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19952530909) 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, 9976280454 + 9976280455.

It is an arithmetic number, because the mean of its divisors is an integer number (9976280455).

Almost surely, 2^19952560909 is an apocalyptic number.

It is an amenable number.

19952560909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19952560909 is an equidigital number, since it uses as much as digits as its factorization.

19952560909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1968300, while the sum is 55.

The spelling of 19952560909 in words is "nineteen billion, nine hundred fifty-two million, five hundred sixty thousand, nine hundred nine".