19633799168 has 38 divisors (see below), whose sum is σ = 39268047726. Its totient is φ = 9816768512.

The previous prime is 19633799149. The next prime is 19633799179. The reversal of 19633799168 is 86199733691.

It can be written as a sum of positive squares in only one way, i.e., 10070523904 + 9563275264 = 100352^2 + 97792^2 .

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 19633799168.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224696 + ... + 299592.

It is an arithmetic number, because the mean of its divisors is an integer number (1033369677).

Almost surely, 2^19633799168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19633799168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19634023863).

19633799168 is an abundant number, since it is smaller than the sum of its proper divisors (19634248558).

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

19633799168 is an frugal number, since it uses more digits than its factorization.

19633799168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74933 (or 74899 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 62.

The spelling of 19633799168 in words is "nineteen billion, six hundred thirty-three million, seven hundred ninety-nine thousand, one hundred sixty-eight".