What does this Assembly snippet output?

1.global _main
2.align 2
3_main:
4    stp x29, x30, [sp, #-48]!
5    mov x29, sp
6    mov w8, #64
7    str w8, [x29, #32]
8    ldr w9, [x29, #32]
9    mul w9, w9, w9
10    sub sp, sp, #16
11    str x9, [sp]
12    adrp x0, fmt@PAGE
13    add x0, x0, fmt@PAGEOFF
14    bl _printf
15    add sp, sp, #16
16    ldp x29, x30, [sp], #48
17    mov w0, #0
18    ret
19.section __TEXT,__cstring
20fmt: .asciz "%d\n"