The number (10^666)!, where 666 is the beast number and n! denotes a factorial. The number has approximately 6.656×10^668 decimal digits. The number of trailing zeros in the Leviathan number is Z | = | sum_(k = 1)^952 ⌊10^666/5^k ⌋ | = | 25×10^664 - 143 (Pickover 1995).