19534581216 has 48 divisors (see below), whose sum is σ = 56975864400. Its totient is φ = 6511526784.

The previous prime is 19534581193. The next prime is 19534581229. The reversal of 19534581216 is 61218543591.

It is a happy number.

19534581216 is a `hidden beast` number, since 1 + 9 + 53 + 4 + 581 + 2 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11303871 + ... + 11305598.

It is an arithmetic number, because the mean of its divisors is an integer number (1186997175).

Almost surely, 2^19534581216 is an apocalyptic number.

19534581216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19534581216 is an abundant number, since it is smaller than the sum of its proper divisors (37441283184).

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

19534581216 is a wasteful number, since it uses less digits than its factorization.

19534581216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22609488 (or 22609474 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The spelling of 19534581216 in words is "nineteen billion, five hundred thirty-four million, five hundred eighty-one thousand, two hundred sixteen".