The exp limit for lvl 50 (if you remain lvl 49) is 13,400,119,400

1: 800
2: 1,600
3: 3,200
4: 6,400
5: 12,800
6: 25,600
7: 51,200
8: 102,400
9: 204,800
10: 409,600
11: 819,600
12: 1,638,400
13: 3,276,800
14: 6,553,600
15: 13,107,200
16: 26,214,400
17: 52,428,800
18: 104,857,600
19: 209,715,200
20: 419,430,400
21: 838,860,800
22: 1,258,291,200
23: 1,677,721,600
24: 2,097,152,000
25: 2,516,582,400
26: 2,936,012,800
27: 3,355,443,200
28: 3,774,487,360
29: 4,194,304,000
30: 4,613,734,400
31: 5,033,164,800
32: 5,452,595,200
33: 5,872,025,600
34: 6,291,456,000
35: 6,710,886,400
36: 7,130,316,800
37: 7,549,747,200
38: 7,969,177,600
39: 8,388,608,000

40: 8,808,038,400
41: 9,227,468,800
42: 9,646,899,200
43: 10,066,329,600
44: 10,485,760,000
45: 10,905,190,400
46: 11,324,620,800
47: 11,744,051,200
48: 12,163,481,600
49: 12,582,912,000
50: 13,002,342,400
51: 13,502,342,400
52: 14,102,342,400
53: 14,702,342,400
54: 15,302,342,400
55: 15,902,342,400
56: 16,602,342,400
57: 17,502,342,400
58: 18,602,342,400
59: 19,902,342,400
60: 21,402,342,400
61: 23,102,200,000
62: 25,002,200,000
63: 27,102,200,000
64: 29,402,200,000
65: 31,902,200,000
66: 34,602,200,000
67: 37,502,200,000
68: 40,602,200,000
69: 43,902,200,000
70: 47,402,200,000
71: 51,102,200,000
72: 55,202,200,000
73: 59,102,200,000
74: 63,403,200,000
75: 67,902,200,000
76: 72.602,200,000
77: 77.402,200,000
78: 82.602,200,000