19718786880 has 896 divisors, whose sum is σ = 82954368000. Its totient is φ = 4359979008.

The previous prime is 19718786873. The next prime is 19718786881. The reversal of 19718786880 is 8868781791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19718786881) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 43916896 + ... + 43917344.

It is an arithmetic number, because the mean of its divisors is an integer number (92583000).

Almost surely, 2^19718786880 is an apocalyptic number.

19718786880 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 19718786880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41477184000).

19718786880 is an abundant number, since it is smaller than the sum of its proper divisors (63235581120).

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

19718786880 is a wasteful number, since it uses less digits than its factorization.

19718786880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 63.

The spelling of 19718786880 in words is "nineteen billion, seven hundred eighteen million, seven hundred eighty-six thousand, eight hundred eighty".