19989697385 has 16 divisors (see below), whose sum is σ = 27497281152. Its totient is φ = 13665801600.

The previous prime is 19989697381. The next prime is 19989697397. The reversal of 19989697385 is 58379698991.

It is not a de Polignac number, because 19989697385 - 2² = 19989697381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19989697381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 851156 + ... + 874325.

It is an arithmetic number, because the mean of its divisors is an integer number (1718580072).

Almost surely, 2^19989697385 is an apocalyptic number.

It is an amenable number.

19989697385 is a deficient number, since it is larger than the sum of its proper divisors (7507583767).

19989697385 is a wasteful number, since it uses less digits than its factorization.

19989697385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725824.

The product of its digits is 264539520, while the sum is 74.

The spelling of 19989697385 in words is "nineteen billion, nine hundred eighty-nine million, six hundred ninety-seven thousand, three hundred eighty-five".