Large List Memory Management in Python

Today I wrote a program using an array / list with 64,000,000 entries. However, when writing sigma=[1]*64000000using Python, it works fine, but later, as the program computes, my Ubuntu freezes - without any reaction to the input, even the mouse movement. I tried twice and the results remained the same.

When it is implemented in C ++, it long long sigma[64000000]works great and works very fast.

Is there a reason why my program freezes in the middle of launch, except for crashes at the beginning?

EDIT: To answer Chris below, my code did not freeze until a few loops appeared.

Thanks everyone!

For those who are interested in viewing the code, this is a program, project Euler 211 with brute force:

def e211():
ans=0
sigma=[1]*64000000
for i in range(2,64000000):
    j=i;
    if ((j%1000==0) or (j<100)):
        print(j)
    q=i*i
    while j<64000000:
        sigma[j]+=q
        j+=i
for i in range(1,64000000):
    j=int(sqrt(sigma[i]))
    if j*j==sigma[i]:
        ans+=i
if __name__=='__main__':
    print(e211())