12867856447 has 4 divisors (see below), whose sum is σ = 12890158336. Its totient is φ = 12845554560.

The previous prime is 12867856439. The next prime is 12867856451. The reversal of 12867856447 is 74465876821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74465876821 = 7 ⋅10637982403.

It is a cyclic number.

It is not a de Polignac number, because 12867856447 - 2³ = 12867856439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12867856391 and 12867856400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12867850447) 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, 11150079 + ... + 11151232.

It is an arithmetic number, because the mean of its divisors is an integer number (3222539584).

Almost surely, 2^12867856447 is an apocalyptic number.

12867856447 is a deficient number, since it is larger than the sum of its proper divisors (22301889).

12867856447 is an equidigital number, since it uses as much as digits as its factorization.

12867856447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22301888.

The product of its digits is 18063360, while the sum is 58.

The spelling of 12867856447 in words is "twelve billion, eight hundred sixty-seven million, eight hundred fifty-six thousand, four hundred forty-seven".