12533651568 has 120 divisors (see below), whose sum is σ = 37083318480. Its totient is φ = 3940807680.

The previous prime is 12533651551. The next prime is 12533651593. The reversal of 12533651568 is 86515633521.

12533651568 is a `hidden beast` number, since 1 + 2 + 5 + 3 + 36 + 51 + 568 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 627658 + ... + 647318.

It is an arithmetic number, because the mean of its divisors is an integer number (309027654).

Almost surely, 2^12533651568 is an apocalyptic number.

12533651568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12533651568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18541659240).

12533651568 is an abundant number, since it is smaller than the sum of its proper divisors (24549666912).

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

12533651568 is a wasteful number, since it uses less digits than its factorization.

12533651568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19927 (or 19918 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 12533651568 in words is "twelve billion, five hundred thirty-three million, six hundred fifty-one thousand, five hundred sixty-eight".