19660823085840 has 80 divisors (see below), whose sum is σ = 61633366819200. Its totient is φ = 5183977317376.

The previous prime is 19660823085821. The next prime is 19660823085853. The reversal of 19660823085840 is 4858032806691.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460203900 + ... + 460246619.

It is an arithmetic number, because the mean of its divisors is an integer number (770417085240).

Almost surely, 2^{19660823085840} is an apocalyptic number.

19660823085840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19660823085840 is an abundant number, since it is smaller than the sum of its proper divisors (41972543733360).

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

19660823085840 is a wasteful number, since it uses less digits than its factorization.

19660823085840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920450624 (or 920450618 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 60.

The spelling of 19660823085840 in words is "nineteen trillion, six hundred sixty billion, eight hundred twenty-three million, eighty-five thousand, eight hundred forty".