19985728019 has 2 divisors, whose sum is σ = 19985728020. Its totient is φ = 19985728018.

The previous prime is 19985727997. The next prime is 19985728043. The reversal of 19985728019 is 91082758991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19985728019 - 2²⁴ = 19968950803 is a prime.

It is a super-2 number, since 2×19985728019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19985728069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9992864009 + 9992864010.

It is an arithmetic number, because the mean of its divisors is an integer number (9992864010).

Almost surely, 2^19985728019 is an apocalyptic number.

19985728019 is a deficient number, since it is larger than the sum of its proper divisors (1).

19985728019 is an equidigital number, since it uses as much as digits as its factorization.

19985728019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 59.

The spelling of 19985728019 in words is "nineteen billion, nine hundred eighty-five million, seven hundred twenty-eight thousand, nineteen".