19715804609 has 2 divisors, whose sum is σ = 19715804610. Its totient is φ = 19715804608.

The previous prime is 19715804593. The next prime is 19715804617. The reversal of 19715804609 is 90640851791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15693073984 + 4022730625 = 125272^2 + 63425^2 .

It is a cyclic number.

It is not a de Polignac number, because 19715804609 - 2⁴ = 19715804593 is a prime.

It is not a weakly prime, because it can be changed into another prime (19715804629) 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, 9857902304 + 9857902305.

It is an arithmetic number, because the mean of its divisors is an integer number (9857902305).

Almost surely, 2^19715804609 is an apocalyptic number.

It is an amenable number.

19715804609 is a deficient number, since it is larger than the sum of its proper divisors (1).

19715804609 is an equidigital number, since it uses as much as digits as its factorization.

19715804609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 19715804609 in words is "nineteen billion, seven hundred fifteen million, eight hundred four thousand, six hundred nine".