19776064978944 has 1216 divisors, whose sum is σ = 65229691392000. Its totient is φ = 5900504924160.

The previous prime is 19776064978939. The next prime is 19776064978951. The reversal of 19776064978944 is 44987946067791.

19776064978944 is a `hidden beast` number, since 1 + 9 + 7 + 7 + 6 + 0 + 6 + 497 + 89 + 44 = 666.

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, 278536126429 + ... + 278536126499.

Almost surely, 2^{19776064978944} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19776064978944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32614845696000).

19776064978944 is an abundant number, since it is smaller than the sum of its proper divisors (45453626413056).

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

19776064978944 is an frugal number, since it uses more digits than its factorization.

19776064978944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 4608866304, while the sum is 81.

The spelling of 19776064978944 in words is "nineteen trillion, seven hundred seventy-six billion, sixty-four million, nine hundred seventy-eight thousand, nine hundred forty-four".