12861547451 has 4 divisors (see below), whose sum is σ = 12866354592. Its totient is φ = 12856740312.

The previous prime is 12861547427. The next prime is 12861547463. The reversal of 12861547451 is 15474516821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15474516821 = 263 ⋅58838467.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12861547451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12861547651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2399555 + ... + 2404908.

It is an arithmetic number, because the mean of its divisors is an integer number (3216588648).

Almost surely, 2^12861547451 is an apocalyptic number.

12861547451 is a deficient number, since it is larger than the sum of its proper divisors (4807141).

12861547451 is an equidigital number, since it uses as much as digits as its factorization.

12861547451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4807140.

The product of its digits is 268800, while the sum is 44.

The spelling of 12861547451 in words is "twelve billion, eight hundred sixty-one million, five hundred forty-seven thousand, four hundred fifty-one".