While 230402457 - 1 was the largest known prime when it was discovered, there really is no 'largest' Prime number. It can be proven that the set of prime numbers is infinite, so we will never be able to label one as the largest.
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99 is the largest two digit number. If I can use the digits anyway I want, then 9 to the 9th power is larger
In binary: 1111 1111 1111 1111 1111 1111 1111 1111 In octal: 37777777777 In hexadecimal: FFFFFFFF in decimal: 2³² - 1 = 4,294,967,295
Although there can be no highest number (you can always add 1 to make a larger number), the largest named number is the googolplex (10 to the googol power, or 10 to the 10 to the 100th power). There are common Latin-based named numerals (billion, trillion) up to around vigintillion (10^63) or centillion (10^303), short scale.
24 is equal to 8 x 3 (the largest possible power of 2), making 23 * 3.
4 -22= -2 x -2 double minus there =4