12446856881 has 4 divisors (see below), whose sum is σ = 12453769764. Its totient is φ = 12439944000.

The previous prime is 12446856871. The next prime is 12446856883. The reversal of 12446856881 is 18865864421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18865864421 = 29 ⋅650547049.

It can be written as a sum of positive squares in 2 ways, for example, as 3341880481 + 9104976400 = 57809^2 + 95420^2 .

It is a cyclic number.

It is not a de Polignac number, because 12446856881 - 2¹⁸ = 12446594737 is a prime.

It is a super-2 number, since 2×12446856881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12446856883) 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, 3453740 + ... + 3457341.

It is an arithmetic number, because the mean of its divisors is an integer number (3113442441).

Almost surely, 2^12446856881 is an apocalyptic number.

It is an amenable number.

12446856881 is a deficient number, since it is larger than the sum of its proper divisors (6912883).

12446856881 is an equidigital number, since it uses as much as digits as its factorization.

12446856881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6912882.

The product of its digits is 2949120, while the sum is 53.

The spelling of 12446856881 in words is "twelve billion, four hundred forty-six million, eight hundred fifty-six thousand, eight hundred eighty-one".