19744797696 has 352 divisors, whose sum is σ = 60745789440. Its totient is φ = 5648154624.

The previous prime is 19744797689. The next prime is 19744797703. The reversal of 19744797696 is 69679744791.

It is an interprime number because it is at equal distance from previous prime (19744797689) and next prime (19744797703).

It is a self number, because there is not a number n which added to its sum of digits gives 19744797696.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86221710 + ... + 86221938.

Almost surely, 2^19744797696 is an apocalyptic number.

19744797696 is a gapful number since it is divisible by the number (16) 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 19744797696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30372894720).

19744797696 is an abundant number, since it is smaller than the sum of its proper divisors (41000991744).

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

19744797696 is a wasteful number, since it uses less digits than its factorization.

19744797696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 391 counting only the distinct ones).

The product of its digits is 144027072, while the sum is 69.

The spelling of 19744797696 in words is "nineteen billion, seven hundred forty-four million, seven hundred ninety-seven thousand, six hundred ninety-six".