19935578989 has 16 divisors (see below), whose sum is σ = 21308821632. Its totient is φ = 18584839168.

The previous prime is 19935578939. The next prime is 19935579029. The reversal of 19935578989 is 98987553991.

It is a cyclic number.

It is not a de Polignac number, because 19935578989 - 2⁹ = 19935578477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19935578939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4652442 + ... + 4656724.

It is an arithmetic number, because the mean of its divisors is an integer number (1331801352).

Almost surely, 2^19935578989 is an apocalyptic number.

It is an amenable number.

19935578989 is a deficient number, since it is larger than the sum of its proper divisors (1373242643).

19935578989 is a wasteful number, since it uses less digits than its factorization.

19935578989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6836.

The product of its digits is 220449600, while the sum is 73.

The spelling of 19935578989 in words is "nineteen billion, nine hundred thirty-five million, five hundred seventy-eight thousand, nine hundred eighty-nine".