How to convert unsigned long long value to a string in qt - qt

Question

I have a calulation that returns large value of factorials of a given number (ex: Factorial of 22 = 17196083355034583040). I want to set the result to a label. I did as shown below.
void Dialog::onNumberChanged(unsigned long long Number)
{
ui->resultPrime->setText(QString::number(Number));
}
MyThread.h
class MyThread : public QThread
{
Q_OBJECT
public:
explicit MyThread(QObject *parent = 0);
void run();
bool Stop;
int inputNumber;
unsigned long long resultFactorial;
void Resume();
void Pause();
bool pause;
private:
QMutex sync;
QWaitCondition pauseCond;
// bool pause;
signals:
void NumberChanged(unsigned long long);
public slots:
};
MyThread.cpp
#include "mythread.h"
#include <QDebug>
#include <QMutex>
#include <QWaitCondition>
MyThread::MyThread(QObject *parent):QThread(parent)
{
pause = false;
}
void MyThread::run()
{
QMutex mutex;
int n = inputNumber;
unsigned long long factorial = 1;
// qDebug() << "Enter a positive integer: ";
// cin >> n;
mutex.lock();
if (n < 0)
qDebug() << "Error! Factorial of a negative number doesn't exist.";
else {
for(int i = 1; i <=n; ++i) {
sync.lock();
if(pause)
pauseCond.wait(&sync); // in this place, your thread will stop to execute until someone calls resume
qDebug() << "Paused for now" << pause;
sync.unlock();
factorial *= i;
MyThread().msleep(1000);
emit NumberChanged(factorial);
}
qDebug() << "Factorial of " << n << " = " << factorial;
}
resultFactorial = factorial;
mutex.unlock();
// return factorial;
}
void MyThread::Resume()
{
sync.lock();
pause = false;
sync.unlock();
pauseCond.wakeAll();
}
void MyThread::Pause()
{
sync.lock();
pause = true;
sync.unlock();
}
Dialog.h
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include "mythread.h"
QT_BEGIN_NAMESPACE
namespace Ui { class Dialog; }
QT_END_NAMESPACE
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = nullptr);
~Dialog();
MyThread *mThread;
private:
Ui::Dialog *ui;
public slots:
void onNumberChanged(unsigned long long);
private slots:
void on_startPrime_clicked();
void on_suspendPrime_clicked();
void on_resumePrime_clicked();
void on_stopPrime_clicked();
};
#endif // DIALOG_H
dialog.cpp
#include "dialog.h"
#include "ui_dialog.h"
#include "mythread.h"
#include <QDebug>
//bool pauseCondition = false;
int statusOfPrimeThread = 0;
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
, ui(new Ui::Dialog)
{
ui->setupUi(this);
mThread = new MyThread(this);
connect(mThread, SIGNAL(NumberChanged(long)), this, SLOT(onNumberChanged(long)));
ui->activeStatePrime->setText(QString("Not Started"));
// connect(this, SIGNAL(on_resumePrime_clicked), mThread, SLOT(Resume()));
}
Dialog::~Dialog()
{
delete ui;
}
void Dialog::onNumberChanged(unsigned long long Number)
{
qDebug() << QString::number(17196083355034583040ull);
ui->resultPrime->setText(QString::number(Number));
}
void Dialog::on_startPrime_clicked()
{
// Started
mThread->inputNumber = ui->lineEditPrime->text().toInt();
mThread->start();
if(mThread->isRunning()){
ui->activeStatePrime->setText(QString("Started"));
}
qDebug() << QString::number(17196083355034583040ull);
}
void Dialog::on_suspendPrime_clicked()
{
//Stopped
// mThread->terminate();
// pauseCondition = true;
// mThread->pause = pauseCondition;
mThread->Pause();
ui->activeStatePrime->setText(QString("Paused"));
}
void Dialog::on_resumePrime_clicked()
{
mThread->Resume();
ui->activeStatePrime->setText(QString("Resumed"));
}
void Dialog::on_stopPrime_clicked()
{
mThread->terminate();
ui->activeStatePrime->setText(QString("Terminated"));
}
But the label is not changed. How can I set such a large value, and I am correctly using unsigned long long datatype or is there any other datatype that can be used.