19989780911 has 2 divisors, whose sum is σ = 19989780912. Its totient is φ = 19989780910.

The previous prime is 19989780869. The next prime is 19989780931. The reversal of 19989780911 is 11908798991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19989780911 - 2²⁶ = 19922672047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19989780931) 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, 9994890455 + 9994890456.

It is an arithmetic number, because the mean of its divisors is an integer number (9994890456).

Almost surely, 2^19989780911 is an apocalyptic number.

19989780911 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989780911 is an equidigital number, since it uses as much as digits as its factorization.

19989780911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 62.

The spelling of 19989780911 in words is "nineteen billion, nine hundred eighty-nine million, seven hundred eighty thousand, nine hundred eleven".