19869695991 has 6 divisors (see below), whose sum is σ = 28700672000. Its totient is φ = 13246463988.

The previous prime is 19869695977. The next prime is 19869696037. The reversal of 19869695991 is 19959696891.

It is not a de Polignac number, because 19869695991 - 2¹⁰ = 19869694967 is a prime.

It is a super-2 number, since 2×19869695991² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19869696991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1103871991 + ... + 1103872008.

Almost surely, 2^19869695991 is an apocalyptic number.

19869695991 is a deficient number, since it is larger than the sum of its proper divisors (8830976009).

19869695991 is a wasteful number, since it uses less digits than its factorization.

19869695991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207744005 (or 2207744002 counting only the distinct ones).

The product of its digits is 85030560, while the sum is 72.

The spelling of 19869695991 in words is "nineteen billion, eight hundred sixty-nine million, six hundred ninety-five thousand, nine hundred ninety-one".