12511251257 has 2 divisors, whose sum is σ = 12511251258. Its totient is φ = 12511251256.

The previous prime is 12511251241. The next prime is 12511251323. The reversal of 12511251257 is 75215211521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6454676281 + 6056574976 = 80341^2 + 77824^2 .

It is a cyclic number.

It is not a de Polignac number, because 12511251257 - 2⁴ = 12511251241 is a prime.

It is not a weakly prime, because it can be changed into another prime (12511251227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6255625628 + 6255625629.

It is an arithmetic number, because the mean of its divisors is an integer number (6255625629).

Almost surely, 2^12511251257 is an apocalyptic number.

It is an amenable number.

12511251257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12511251257 is an equidigital number, since it uses as much as digits as its factorization.

12511251257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7000, while the sum is 32.

Adding to 12511251257 its reverse (75215211521), we get a palindrome (87726462778).

The spelling of 12511251257 in words is "twelve billion, five hundred eleven million, two hundred fifty-one thousand, two hundred fifty-seven".