19729985216 has 56 divisors (see below), whose sum is σ = 41177407104. Its totient is φ = 9366589440.

The previous prime is 19729985179. The next prime is 19729985221. The reversal of 19729985216 is 61258992791.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11336 + ... + 198968.

Almost surely, 2^19729985216 is an apocalyptic number.

19729985216 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 19729985216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20588703552).

19729985216 is an abundant number, since it is smaller than the sum of its proper divisors (21447421888).

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

19729985216 is a wasteful number, since it uses less digits than its factorization.

19729985216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187729 (or 187719 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 59.

The spelling of 19729985216 in words is "nineteen billion, seven hundred twenty-nine million, nine hundred eighty-five thousand, two hundred sixteen".