12511251251 has 4 divisors (see below), whose sum is σ = 12669621600. Its totient is φ = 12352880904.

The previous prime is 12511251241. The next prime is 12511251257. The reversal of 12511251251 is 15215211521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12511251251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12511251251.

It is not an unprimeable number, because it can be changed into a prime (12511251257) 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 in 3 ways as a sum of consecutive naturals, for example, 79185056 + ... + 79185213.

It is an arithmetic number, because the mean of its divisors is an integer number (3167405400).

Almost surely, 2^12511251251 is an apocalyptic number.

12511251251 is a deficient number, since it is larger than the sum of its proper divisors (158370349).

12511251251 is an equidigital number, since it uses as much as digits as its factorization.

12511251251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158370348.

The product of its digits is 1000, while the sum is 26.

Adding to 12511251251 its reverse (15215211521), we get a palindrome (27726462772).

The spelling of 12511251251 in words is "twelve billion, five hundred eleven million, two hundred fifty-one thousand, two hundred fifty-one".