19516543872 has 64 divisors (see below), whose sum is σ = 59246659200. Its totient is φ = 5576154624.

The previous prime is 19516543867. The next prime is 19516543873. The reversal of 19516543872 is 27834561591.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19516543873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3627622 + ... + 3632997.

It is an arithmetic number, because the mean of its divisors is an integer number (925729050).

Almost surely, 2^19516543872 is an apocalyptic number.

19516543872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19516543872 is an abundant number, since it is smaller than the sum of its proper divisors (39730115328).

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

19516543872 is an equidigital number, since it uses as much as digits as its factorization.

19516543872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7260643 (or 7260631 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 51.

The spelling of 19516543872 in words is "nineteen billion, five hundred sixteen million, five hundred forty-three thousand, eight hundred seventy-two".