19996066944 has 640 divisors, whose sum is σ = 75888489600. Its totient is φ = 5088116736.

The previous prime is 19996066933. The next prime is 19996066949. The reversal of 19996066944 is 44966069991.

19996066944 is a `hidden beast` number, since 19 + 9 + 9 + 606 + 6 + 9 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (19996066949) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 23441622 + ... + 23442474.

It is an arithmetic number, because the mean of its divisors is an integer number (118575765).

Almost surely, 2^19996066944 is an apocalyptic number.

19996066944 is a gapful number since it is divisible by the number (14) 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 19996066944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37944244800).

19996066944 is an abundant number, since it is smaller than the sum of its proper divisors (55892422656).

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

19996066944 is a wasteful number, since it uses less digits than its factorization.

19996066944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 63.

The spelling of 19996066944 in words is "nineteen billion, nine hundred ninety-six million, sixty-six thousand, nine hundred forty-four".