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!, Factorial (10)= 3628800
What is factorial? What is that operation? Factorial n means 1 * 2 * 3 * 4 * ... * n. It means that starting from n you multiply by every number that is once smaller than it to one. Then you stop. For example 5 factorial: 5! is equal to 1 * 2 * 3 * 4 * 5 = 120. So it is big number. Power of factorial is increasing enormously, and 100 is equal to 9.332621544E+157. They grow very fast. So it is very big distance from 5! and 100!. High level factorials end with zero every time, because it was multiplication by 5 and by 2.
Next factorial from previous differs in such way: n! = n * (n-1)!. So 6! = 6 * 5! = 6 * 120 = 720. 7! factorial will be 7 * 6! and so on. 0! is equivalent to 1. This is one exception. Factorials are used in combinatorics and probability theory mostly.

Examples and formulas:
2! + 3! is not equal to 5!. Using above formula 2! + 3! = ( 1 * 2! + 3 * 2!) = 2! ( 1 + 3) = 8
2! * 4! is not equal to 8!. In similar way as above 2! * 4! = ( 1 * 2! * 4 * 3 * 2!) = 2! * 2! ( 1 * 4 * 3 ) = 48

Factorials from 1 to 100

1  = 1 26  = 4.032914611E+26 51  = 1.551118753E+66 76  = 1.885494702E+111
2  = 2 27  = 1.088886945E+28 52  = 8.065817517E+67 77  = 1.45183092E+113
3  = 6 28  = 3.048883446E+29 53  = 4.274883284E+69 78  = 1.132428118E+115
4  = 24 29  = 8.841761994E+30 54  = 2.308436973E+71 79  = 8.946182131E+116
5  = 120 30  = 2.652528598E+32 55  = 1.269640335E+73 80  = 7.156945705E+118
6  = 720 31  = 8.222838654E+33 56  = 7.109985878E+74 81  = 5.797126021E+120
7  = 5040 32  = 2.631308369E+35 57  = 4.05269195E+76 82  = 4.753643337E+122
8  = 40320 33  = 8.683317619E+36 58  = 2.350561331E+78 83  = 3.94552397E+124
9  = 362880 34  = 2.95232799E+38 59  = 1.386831185E+80 84  = 3.314240135E+126
10  = 3628800 35  = 1.033314797E+40 60  = 8.320987113E+81 85  = 2.817104114E+128
11  = 39916800 36  = 3.719933268E+41 61  = 5.075802139E+83 86  = 2.422709538E+130
12  = 479001600 37  = 1.376375309E+43 62  = 3.146997326E+85 87  = 2.107757298E+132
13  = 6227020800 38  = 5.230226175E+44 63  = 1.982608315E+87 88  = 1.854826423E+134
14  = 8.71782912E+10 39  = 2.039788208E+46 64  = 1.268869322E+89 89  = 1.650795516E+136
15  = 1.307674368E+12 40  = 8.159152832E+47 65  = 8.247650592E+90 90  = 1.485715964E+138
16  = 2.092278989E+13 41  = 3.345252661E+49 66  = 5.443449391E+92 91  = 1.352001528E+140
17  = 3.556874281E+14 42  = 1.405006118E+51 67  = 3.647111092E+94 92  = 1.243841405E+142
18  = 6.402373706E+15 43  = 6.041526306E+52 68  = 2.480035542E+96 93  = 1.156772507E+144
19  = 1.216451004E+17 44  = 2.658271575E+54 69  = 1.711224524E+98 94  = 1.087366157E+146
20  = 2.432902008E+18 45  = 1.196222209E+56 70  = 1.197857167E+100 95  = 1.032997849E+148
21  = 5.109094217E+19 46  = 5.50262216E+57 71  = 8.504785886E+101 96  = 9.916779349E+149
22  = 1.124000728E+21 47  = 2.586232415E+59 72  = 6.123445838E+103 97  = 9.619275968E+151
23  = 2.585201674E+22 48  = 1.241391559E+61 73  = 4.470115462E+105 98  = 9.426890449E+153
24  = 6.204484017E+23 49  = 6.08281864E+62 74  = 3.307885442E+107 99  = 9.332621544E+155
25  = 1.551121004E+25 50  = 3.04140932E+64 75  = 2.480914081E+109 100  = 9.332621544E+157
 
 
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