12851972519 has 4 divisors (see below), whose sum is σ = 12855255840. Its totient is φ = 12848689200.

The previous prime is 12851972461. The next prime is 12851972531. The reversal of 12851972519 is 91527915821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91527915821 = 23789 ⋅3847489.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12851972519 is a prime.

It is a super-2 number, since 2×12851972519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12851974519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635782 + ... + 1643619.

It is an arithmetic number, because the mean of its divisors is an integer number (3213813960).

Almost surely, 2^12851972519 is an apocalyptic number.

12851972519 is a deficient number, since it is larger than the sum of its proper divisors (3283321).

12851972519 is an equidigital number, since it uses as much as digits as its factorization.

12851972519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283320.

The product of its digits is 453600, while the sum is 50.

The spelling of 12851972519 in words is "twelve billion, eight hundred fifty-one million, nine hundred seventy-two thousand, five hundred nineteen".