19566442828920 has 256 divisors, whose sum is σ = 64949124240000. Its totient is φ = 4684309733376.

The previous prime is 19566442828871. The next prime is 19566442828931. The reversal of 19566442828920 is 2982824466591.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 147061786 + ... + 147194774.

Almost surely, 2^{19566442828920} is an apocalyptic number.

19566442828920 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 19566442828920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32474562120000).

19566442828920 is an abundant number, since it is smaller than the sum of its proper divisors (45382681411080).

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

19566442828920 is a wasteful number, since it uses less digits than its factorization.

19566442828920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135602 (or 135598 counting only the distinct ones).

The product of its (nonzero) digits is 119439360, while the sum is 66.

The spelling of 19566442828920 in words is "nineteen trillion, five hundred sixty-six billion, four hundred forty-two million, eight hundred twenty-eight thousand, nine hundred twenty".