19713976609 has 2 divisors, whose sum is σ = 19713976610. Its totient is φ = 19713976608.

The previous prime is 19713976531. The next prime is 19713976627. The reversal of 19713976609 is 90667931791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10641985600 + 9071991009 = 103160^2 + 95247^2 .

It is a cyclic number.

It is not a de Polignac number, because 19713976609 - 2⁹ = 19713976097 is a prime.

It is not a weakly prime, because it can be changed into another prime (19713976409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9856988304 + 9856988305.

It is an arithmetic number, because the mean of its divisors is an integer number (9856988305).

Almost surely, 2^19713976609 is an apocalyptic number.

It is an amenable number.

19713976609 is a deficient number, since it is larger than the sum of its proper divisors (1).

19713976609 is an equidigital number, since it uses as much as digits as its factorization.

19713976609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3857868, while the sum is 58.

The spelling of 19713976609 in words is "nineteen billion, seven hundred thirteen million, nine hundred seventy-six thousand, six hundred nine".