12344556678890 has 32 divisors (see below), whose sum is σ = 22231332990720. Its totient is φ = 4935349759744.

The previous prime is 12344556678863. The next prime is 12344556678899. The reversal of 12344556678890 is 9887665544321.

It is a self number, because there is not a number n which added to its sum of digits gives 12344556678890.

It is not an unprimeable number, because it can be changed into a prime (12344556678899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173457554 + ... + 173528706.

It is an arithmetic number, because the mean of its divisors is an integer number (694729155960).

It is a 2-persistent number, because it is pandigital, and so is 2⋅12344556678890 = 24689113357780, but 3⋅12344556678890 = 37033670036670 is not.

Almost surely, 2^{12344556678890} is an apocalyptic number.

12344556678890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12344556678890 is a deficient number, since it is larger than the sum of its proper divisors (9886776311830).

12344556678890 is a wasteful number, since it uses less digits than its factorization.

12344556678890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79606.

The product of its (nonzero) digits is 348364800, while the sum is 68.

The spelling of 12344556678890 in words is "twelve trillion, three hundred forty-four billion, five hundred fifty-six million, six hundred seventy-eight thousand, eight hundred ninety".