19699724393 has 2 divisors, whose sum is σ = 19699724394. Its totient is φ = 19699724392.

The previous prime is 19699724383. The next prime is 19699724413. The reversal of 19699724393 is 39342799691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17996759104 + 1702965289 = 134152^2 + 41267^2 .

It is a cyclic number.

It is not a de Polignac number, because 19699724393 - 2⁴ = 19699724377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19699724323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9849862196 + 9849862197.

It is an arithmetic number, because the mean of its divisors is an integer number (9849862197).

Almost surely, 2^19699724393 is an apocalyptic number.

It is an amenable number.

19699724393 is a deficient number, since it is larger than the sum of its proper divisors (1).

19699724393 is an equidigital number, since it uses as much as digits as its factorization.

19699724393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19840464, while the sum is 62.

The spelling of 19699724393 in words is "nineteen billion, six hundred ninety-nine million, seven hundred twenty-four thousand, three hundred ninety-three".