19660650000 has 120 divisors (see below), whose sum is σ = 63483936768. Its totient is φ = 5242800000.

The previous prime is 19660649999. The next prime is 19660650013. The reversal of 19660650000 is 5606691.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84465 + ... + 215535.

Almost surely, 2^19660650000 is an apocalyptic number.

19660650000 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 19660650000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31741968384).

19660650000 is an abundant number, since it is smaller than the sum of its proper divisors (43823286768).

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

19660650000 is an equidigital number, since it uses as much as digits as its factorization.

19660650000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131107 (or 131081 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The spelling of 19660650000 in words is "nineteen billion, six hundred sixty million, six hundred fifty thousand".