12543216525 has 144 divisors (see below), whose sum is σ = 26833532544. Its totient is φ = 5689543680.

The previous prime is 12543216493. The next prime is 12543216533. The reversal of 12543216525 is 52561234521.

12543216525 is a `hidden beast` number, since 1 + 254 + 321 + 65 + 25 = 666.

It is not a de Polignac number, because 12543216525 - 2⁵ = 12543216493 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 12543216525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5824849 + ... + 5827001.

It is an arithmetic number, because the mean of its divisors is an integer number (186343976).

Almost surely, 2^12543216525 is an apocalyptic number.

12543216525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12543216525 is an abundant number, since it is smaller than the sum of its proper divisors (14290316019).

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

12543216525 is a wasteful number, since it uses less digits than its factorization.

12543216525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322 (or 2305 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The spelling of 12543216525 in words is "twelve billion, five hundred forty-three million, two hundred sixteen thousand, five hundred twenty-five".