12544911918 has 384 divisors, whose sum is σ = 37418434560. Its totient is φ = 2963822400.

The previous prime is 12544911913. The next prime is 12544911923. The reversal of 12544911918 is 81911944521.

It is a happy number.

12544911918 is a `hidden beast` number, since 1 + 2 + 544 + 9 + 11 + 91 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (12544911913) and next prime (12544911923).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12544911913) 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 in 191 ways as a sum of consecutive naturals, for example, 98778771 + ... + 98778897.

It is an arithmetic number, because the mean of its divisors is an integer number (97443840).

Almost surely, 2^12544911918 is an apocalyptic number.

12544911918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12544911918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18709217280).

12544911918 is an abundant number, since it is smaller than the sum of its proper divisors (24873522642).

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

12544911918 is a wasteful number, since it uses less digits than its factorization.

12544911918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 200 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The spelling of 12544911918 in words is "twelve billion, five hundred forty-four million, nine hundred eleven thousand, nine hundred eighteen".