19912975680 has 224 divisors, whose sum is σ = 68527476864. Its totient is φ = 4869955584.

The previous prime is 19912975639. The next prime is 19912975699. The reversal of 19912975680 is 8657921991.

It is a self number, because there is not a number n which added to its sum of digits gives 19912975680.

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, 1954279 + ... + 1964441.

It is an arithmetic number, because the mean of its divisors is an integer number (305926236).

Almost surely, 2^19912975680 is an apocalyptic number.

19912975680 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 19912975680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34263738432).

19912975680 is an abundant number, since it is smaller than the sum of its proper divisors (48614501184).

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

19912975680 is a wasteful number, since it uses less digits than its factorization.

19912975680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10353 (or 10343 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 57.

The spelling of 19912975680 in words is "nineteen billion, nine hundred twelve million, nine hundred seventy-five thousand, six hundred eighty".