19534043648 has 120 divisors (see below), whose sum is σ = 46969510500. Its totient is φ = 8082751488.

The previous prime is 19534043623. The next prime is 19534043653. The reversal of 19534043648 is 84634043591.

It can be written as a sum of positive squares in 2 ways, for example, as 19318776064 + 215267584 = 138992^2 + 14672^2 .

It is a super-2 number, since 2×19534043648² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 714128 + ... + 740976.

Almost surely, 2^19534043648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19534043648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23484755250).

19534043648 is an abundant number, since it is smaller than the sum of its proper divisors (27435466852).

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

19534043648 is an equidigital number, since it uses as much as digits as its factorization.

19534043648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26910 (or 26887 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 19534043648 in words is "nineteen billion, five hundred thirty-four million, forty-three thousand, six hundred forty-eight".