252525252

252525252 is a nine-digit decimal number. Its digits form a palindrome and alternate between 2 and 5, producing the sequence 2-5-2-5-2-5-2-5-2. In standard notation it is written as 252,525,252.

The number is even, so divisible by 2. The sum of its digits is 30, making it divisible by 3 (and therefore by 6). Because the last two digits are 52, it is divisible by 4, and thus by 12. Indeed, 252,525,252 divided by 12 equals 21,043,771. Consequently the number factors as 12 multiplied by 21,043,771, so its prime factors include two and three, with 21,043,771 as the remaining cofactor.

Structurally, the value can be seen as four repetitions of the two-digit block 25 with a trailing 2, yielding a symmetrical, palindromic pattern in base-10 representation.

Context and usage: In mathematics and computer science, 252525252 is primarily encountered as an example of a decimal palindrome and as a test case for string or pattern algorithms. There is no widely recognized association with a specific date, product, or event.