19911960000 has 560 divisors, whose sum is σ = 74271225600. Its totient is φ = 5228928000.

The previous prime is 19911959989. The next prime is 19911960007. The reversal of 19911960000 is 6911991.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19911960007) 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, 111239911 + ... + 111240089.

Almost surely, 2^19911960000 is an apocalyptic number.

19911960000 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 19911960000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37135612800).

19911960000 is an abundant number, since it is smaller than the sum of its proper divisors (54359265600).

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

19911960000 is a wasteful number, since it uses less digits than its factorization.

19911960000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The spelling of 19911960000 in words is "nineteen billion, nine hundred eleven million, nine hundred sixty thousand".