12225512436678 has 32 divisors (see below), whose sum is σ = 28349014348800. Its totient is φ = 3897989472168.

The previous prime is 12225512436673. The next prime is 12225512436707. The reversal of 12225512436678 is 87663421552221.

12225512436678 is a `hidden beast` number, since 1 + 2 + 2 + 2 + 551 + 24 + 3 + 6 + 67 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12225512436673) 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, 4921702638 + ... + 4921705121.

It is an arithmetic number, because the mean of its divisors is an integer number (885906698400).

Almost surely, 2^{12225512436678} is an apocalyptic number.

12225512436678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12225512436678 is an abundant number, since it is smaller than the sum of its proper divisors (16123501912122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12225512436678 is a wasteful number, since it uses less digits than its factorization.

12225512436678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9843407793 (or 9843407787 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 54.

Adding to 12225512436678 its reverse (87663421552221), we get a palindrome (99888933988899).

The spelling of 12225512436678 in words is "twelve trillion, two hundred twenty-five billion, five hundred twelve million, four hundred thirty-six thousand, six hundred seventy-eight".