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A septendecillion or septdecillion is equal to 1054 in America, or 10102 in France and Germany.[1][2]

In the long scale, 1054 is called nonillion, which is commonly used in France and Germany. Sbiis Saibian calls this number nonilliad using his -illiad suffix.[3]

This number is also called oktadekillion in Russ Rowlett's Greek-based naming system.[4]

Decimal

• 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 - short scale
• 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 - long scale

Examples

• The volume of the Pleiades Star Cluster (a nearby star cluster within the Milky Way Galaxy) is roughly 226 septendecillion cubic centimeters.[5]
• The prefix tenayotta- multiplies by one septendecillion.

Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{54}$$
Arrow notation $$10\uparrow54$$
Steinhaus-Moser Notation 34[3] 35[3]
Copy notation 9[54] 1[55]
Taro's multivariable Ackermann function A(3,176) A(3,177)
Pound-Star Notation #*(5,6,4,6,0,2)*6 #*(1,7,8,1,3)*8
BEAF {10,54}
Bashicu matrix system (0)(0)(0)(0)[2371] (0)(0)(0)(0)[2372]
Hyperfactorial array notation 43! 44!
Fast-growing hierarchy $$f_2(171)$$ $$f_2(172)$$
Hardy hierarchy $$H_{\omega^2}(171)$$ $$H_{\omega^2}(172)$$
Slow-growing hierarchy $$g_{\omega^{\omega5+4}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{102}$$
Arrow notation $$10\uparrow102$$
Steinhaus-Moser Notation 57[3] 58[3]
Copy notation 9[102] 1[103]
Taro's multivariable Ackermann function A(3,335) A(3,336)
Pound-Star Notation #*(10)*100
BEAF {10,102}
Bashicu matrix system (0)(0)(0)(0)(0)[1539] (0)(0)(0)(0)(0)[1540]
Hyperfactorial array notation 71! 72!
Fast-growing hierarchy $$f_2(330)$$ $$f_2(331)$$
Hardy hierarchy $$H_{\omega^2}(330)$$ $$H_{\omega^2}(331)$$
Slow-growing hierarchy $$g_{\omega^{\omega^2+2}}(10)$$

List of prefixed numbers derived from decillion

Name Short scale Long scale
undecillion 1036 1066
duodecillion 1039 1072
tredecillion 1042 1078
quattuordecillion 1045 1084
quindecillion 1048 1090
sexdecillion 1051 1096
septendecillion 1054 10102
octodecillion 1057 10108
novemdecillion 1060 10114