19692419909 has 2 divisors, whose sum is σ = 19692419910. Its totient is φ = 19692419908.

The previous prime is 19692419839. The next prime is 19692419947. The reversal of 19692419909 is 90991429691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15359884225 + 4332535684 = 123935^2 + 65822^2 .

It is a cyclic number.

It is not a de Polignac number, because 19692419909 - 2⁸ = 19692419653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19692419969) 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, 9846209954 + 9846209955.

It is an arithmetic number, because the mean of its divisors is an integer number (9846209955).

Almost surely, 2^19692419909 is an apocalyptic number.

It is an amenable number.

19692419909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19692419909 is an equidigital number, since it uses as much as digits as its factorization.

19692419909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2834352, while the sum is 59.

The spelling of 19692419909 in words is "nineteen billion, six hundred ninety-two million, four hundred nineteen thousand, nine hundred nine".