19639478320000 has 480 divisors, whose sum is σ = 62043953673240. Its totient is φ = 6121382400000.

The previous prime is 19639478319953. The next prime is 19639478320067. The reversal of 19639478320000 is 2387493691.

It is a super-3 number, since 3×19639478320000³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19639478320000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 42892270 + ... + 43347730.

Almost surely, 2^{19639478320000} is an apocalyptic number.

19639478320000 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 19639478320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31021976836620).

19639478320000 is an abundant number, since it is smaller than the sum of its proper divisors (42404475353240).

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

19639478320000 is an equidigital number, since it uses as much as digits as its factorization.

19639478320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455520 (or 455486 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 19639478320000 in words is "nineteen trillion, six hundred thirty-nine billion, four hundred seventy-eight million, three hundred twenty thousand".