12678415649 has 4 divisors (see below), whose sum is σ = 13229651136. Its totient is φ = 12127180164.

The previous prime is 12678415583. The next prime is 12678415657. The reversal of 12678415649 is 94651487621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12678415649 - 2¹² = 12678411553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12678415649.

It is not an unprimeable number, because it can be changed into a prime (12678415699) 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, 275617709 + ... + 275617754.

It is an arithmetic number, because the mean of its divisors is an integer number (3307412784).

Almost surely, 2^12678415649 is an apocalyptic number.

It is an amenable number.

12678415649 is a deficient number, since it is larger than the sum of its proper divisors (551235487).

12678415649 is an equidigital number, since it uses as much as digits as its factorization.

12678415649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551235486.

The product of its digits is 2903040, while the sum is 53.

The spelling of 12678415649 in words is "twelve billion, six hundred seventy-eight million, four hundred fifteen thousand, six hundred forty-nine".