19803712512 has 66 divisors (see below), whose sum is σ = 52804911468. Its totient is φ = 6598637568.

The previous prime is 19803712469. The next prime is 19803712543. The reversal of 19803712512 is 21521730891.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7798539 + ... + 7801077.

Almost surely, 2^19803712512 is an apocalyptic number.

19803712512 is a gapful number since it is divisible by the number (12) 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 19803712512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26402455734).

19803712512 is an abundant number, since it is smaller than the sum of its proper divisors (33001198956).

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

19803712512 is an frugal number, since it uses more digits than its factorization.

19803712512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5101 (or 2544 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 19803712512 in words is "nineteen billion, eight hundred three million, seven hundred twelve thousand, five hundred twelve".