12509208851 has 4 divisors (see below), whose sum is σ = 12721229400. Its totient is φ = 12297188304.

The previous prime is 12509208839. The next prime is 12509208883. The reversal of 12509208851 is 15880290521.

12509208851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15880290521 = 6803 ⋅2334307.

It is a cyclic number.

It is not a de Polignac number, because 12509208851 - 2¹⁰ = 12509207827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12509208799 and 12509208808.

It is not an unprimeable number, because it can be changed into a prime (12509208251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106010186 + ... + 106010303.

It is an arithmetic number, because the mean of its divisors is an integer number (3180307350).

Almost surely, 2^12509208851 is an apocalyptic number.

12509208851 is a deficient number, since it is larger than the sum of its proper divisors (212020549).

12509208851 is an equidigital number, since it uses as much as digits as its factorization.

12509208851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212020548.

The product of its (nonzero) digits is 57600, while the sum is 41.

The spelling of 12509208851 in words is "twelve billion, five hundred nine million, two hundred eight thousand, eight hundred fifty-one".