19899879936 has 80 divisors (see below), whose sum is σ = 53432484864. Its totient is φ = 6580998144.

The previous prime is 19899879877. The next prime is 19899879983. The reversal of 19899879936 is 63997899891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144066 + ... + 246078.

Almost surely, 2^19899879936 is an apocalyptic number.

19899879936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19899879936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26716242432).

19899879936 is an abundant number, since it is smaller than the sum of its proper divisors (33532604928).

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

19899879936 is a wasteful number, since it uses less digits than its factorization.

19899879936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102161 (or 102145 counting only the distinct ones).

The product of its digits is 476171136, while the sum is 78.

The spelling of 19899879936 in words is "nineteen billion, eight hundred ninety-nine million, eight hundred seventy-nine thousand, nine hundred thirty-six".