12678378346 has 4 divisors (see below), whose sum is σ = 19017567522. Its totient is φ = 6339189172.

The previous prime is 12678378341. The next prime is 12678378347. The reversal of 12678378346 is 64387387621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11732139225 + 946239121 = 108315^2 + 30761^2 .

It is not an unprimeable number, because it can be changed into a prime (12678378341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3169594585 + ... + 3169594588.

Almost surely, 2^12678378346 is an apocalyptic number.

12678378346 is a deficient number, since it is larger than the sum of its proper divisors (6339189176).

12678378346 is an equidigital number, since it uses as much as digits as its factorization.

12678378346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6339189175.

The product of its digits is 8128512, while the sum is 55.

The spelling of 12678378346 in words is "twelve billion, six hundred seventy-eight million, three hundred seventy-eight thousand, three hundred forty-six".