12343445678 has 4 divisors (see below), whose sum is σ = 18515168520. Its totient is φ = 6171722838.

The previous prime is 12343445671. The next prime is 12343445683. The reversal of 12343445678 is 87654434321.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12343445671) 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, 3085861418 + ... + 3085861421.

It is an arithmetic number, because the mean of its divisors is an integer number (4628792130).

Almost surely, 2^12343445678 is an apocalyptic number.

12343445678 is a deficient number, since it is larger than the sum of its proper divisors (6171722842).

12343445678 is an equidigital number, since it uses as much as digits as its factorization.

12343445678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6171722841.

The product of its digits is 1935360, while the sum is 47.

Adding to 12343445678 its reverse (87654434321), we get a palindrome (99997879999).

The spelling of 12343445678 in words is "twelve billion, three hundred forty-three million, four hundred forty-five thousand, six hundred seventy-eight".