12551868864 has 140 divisors (see below), whose sum is σ = 37679884000. Its totient is φ = 4130860032.

The previous prime is 12551868853. The next prime is 12551868869. The reversal of 12551868864 is 46886815521.

12551868864 is a `hidden beast` number, since 1 + 2 + 5 + 518 + 68 + 8 + 64 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 12551868864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12551868869) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 394212 + ... + 424860.

Almost surely, 2^12551868864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12551868864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18839942000).

12551868864 is an abundant number, since it is smaller than the sum of its proper divisors (25128015136).

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

12551868864 is an equidigital number, since it uses as much as digits as its factorization.

12551868864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30752 (or 30733 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 54.

The spelling of 12551868864 in words is "twelve billion, five hundred fifty-one million, eight hundred sixty-eight thousand, eight hundred sixty-four".