19888008660 has 144 divisors (see below), whose sum is σ = 65464439040. Its totient is φ = 4858064640.

The previous prime is 19888008607. The next prime is 19888008709. The reversal of 19888008660 is 6680088891.

It is a junction number, because it is equal to n+sod(n) for n = 19888008597 and 19888008606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 274101 + ... + 338979.

It is an arithmetic number, because the mean of its divisors is an integer number (454614160).

Almost surely, 2^19888008660 is an apocalyptic number.

19888008660 is a gapful number since it is divisible by the number (10) 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 19888008660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32732219520).

19888008660 is an abundant number, since it is smaller than the sum of its proper divisors (45576430380).

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

19888008660 is a wasteful number, since it uses less digits than its factorization.

19888008660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65038 (or 65033 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The spelling of 19888008660 in words is "nineteen billion, eight hundred eighty-eight million, eight thousand, six hundred sixty".