19971888192 has 42 divisors (see below), whose sum is σ = 57245813118. Its totient is φ = 6657295872.

The previous prime is 19971888191. The next prime is 19971888221. The reversal of 19971888192 is 29188817991.

It can be written as a sum of positive squares in only one way, i.e., 10472656896 + 9499231296 = 102336^2 + 97464^2 .

It is not an unprimeable number, because it can be changed into a prime (19971888191) 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, 17336133 + ... + 17337284.

Almost surely, 2^19971888192 is an apocalyptic number.

19971888192 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19971888192 is an abundant number, since it is smaller than the sum of its proper divisors (37273924926).

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

19971888192 is a wasteful number, since it uses less digits than its factorization.

19971888192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34673435 (or 34673422 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 63.

The spelling of 19971888192 in words is "nineteen billion, nine hundred seventy-one million, eight hundred eighty-eight thousand, one hundred ninety-two".