12181567536 has 80 divisors (see below), whose sum is σ = 35709619200. Its totient is φ = 3974121792.

The previous prime is 12181567529. The next prime is 12181567571. The reversal of 12181567536 is 63576518121.

12181567536 is a `hidden beast` number, since 1 + 2 + 1 + 81 + 567 + 5 + 3 + 6 = 666.

It is a super-2 number, since 2×12181567536² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12181567491 and 12181567500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279676 + ... + 320283.

It is an arithmetic number, because the mean of its divisors is an integer number (446370240).

Almost surely, 2^12181567536 is an apocalyptic number.

12181567536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12181567536 is an abundant number, since it is smaller than the sum of its proper divisors (23528051664).

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

12181567536 is a wasteful number, since it uses less digits than its factorization.

12181567536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600023 (or 600011 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 12181567536 in words is "twelve billion, one hundred eighty-one million, five hundred sixty-seven thousand, five hundred thirty-six".