19547432447 has 16 divisors (see below), whose sum is σ = 20323177728. Its totient is φ = 18781079040.

The previous prime is 19547432413. The next prime is 19547432477. The reversal of 19547432447 is 74423474591.

It is a cyclic number.

It is not a de Polignac number, because 19547432447 - 2²⁴ = 19530655231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19547432395 and 19547432404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19547432477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4572503 + ... + 4576775.

It is an arithmetic number, because the mean of its divisors is an integer number (1270198608).

Almost surely, 2^19547432447 is an apocalyptic number.

19547432447 is a deficient number, since it is larger than the sum of its proper divisors (775745281).

19547432447 is a wasteful number, since it uses less digits than its factorization.

19547432447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330.

The product of its digits is 3386880, while the sum is 50.

The spelling of 19547432447 in words is "nineteen billion, five hundred forty-seven million, four hundred thirty-two thousand, four hundred forty-seven".