19699191988 has 24 divisors (see below), whose sum is σ = 39759843200. Its totient is φ = 8365055328.

The previous prime is 19699191947. The next prime is 19699191989. The reversal of 19699191988 is 88919199691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19699191989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3224208 + ... + 3230311.

Almost surely, 2^19699191988 is an apocalyptic number.

It is an amenable number.

19699191988 is an abundant number, since it is smaller than the sum of its proper divisors (20060651212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19699191988 is a wasteful number, since it uses less digits than its factorization.

19699191988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6454639 (or 6454637 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 70.

The spelling of 19699191988 in words is "nineteen billion, six hundred ninety-nine million, one hundred ninety-one thousand, nine hundred eighty-eight".