12256681649 has 8 divisors (see below), whose sum is σ = 12614827968. Its totient is φ = 11903688720.

The previous prime is 12256681643. The next prime is 12256681663. The reversal of 12256681649 is 94618665221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12256681649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12256681597 and 12256681606.

It is not an unprimeable number, because it can be changed into a prime (12256681643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1283522 + ... + 1293035.

It is an arithmetic number, because the mean of its divisors is an integer number (1576853496).

Almost surely, 2^12256681649 is an apocalyptic number.

It is an amenable number.

12256681649 is a deficient number, since it is larger than the sum of its proper divisors (358146319).

12256681649 is an equidigital number, since it uses as much as digits as its factorization.

12256681649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576695.

The product of its digits is 1244160, while the sum is 50.

The spelling of 12256681649 in words is "twelve billion, two hundred fifty-six million, six hundred eighty-one thousand, six hundred forty-nine".