19935965999 has 2 divisors, whose sum is σ = 19935966000. Its totient is φ = 19935965998.

The previous prime is 19935965989. The next prime is 19935966023. The reversal of 19935965999 is 99956953991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19935965999 - 2²⁰ = 19934917423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19935965989) 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, 9967982999 + 9967983000.

It is an arithmetic number, because the mean of its divisors is an integer number (9967983000).

Almost surely, 2^19935965999 is an apocalyptic number.

19935965999 is a deficient number, since it is larger than the sum of its proper divisors (1).

19935965999 is an equidigital number, since it uses as much as digits as its factorization.

19935965999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 239148450, while the sum is 74.

The spelling of 19935965999 in words is "nineteen billion, nine hundred thirty-five million, nine hundred sixty-five thousand, nine hundred ninety-nine".