12541216525 has 6 divisors (see below), whose sum is σ = 15551108522. Its totient is φ = 10032973200.

The previous prime is 12541216433. The next prime is 12541216537. The reversal of 12541216525 is 52561214521.

It can be written as a sum of positive squares in 3 ways, for example, as 10876804 + 12530339721 = 3298^2 + 111939^2 .

It is not a de Polignac number, because 12541216525 - 2⁷ = 12541216397 is a prime.

It is a super-2 number, since 2×12541216525² (a number of 21 digits) contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 250824306 + ... + 250824355.

Almost surely, 2^12541216525 is an apocalyptic number.

It is an amenable number.

12541216525 is a deficient number, since it is larger than the sum of its proper divisors (3009891997).

12541216525 is an equidigital number, since it uses as much as digits as its factorization.

12541216525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501648671 (or 501648666 counting only the distinct ones).

The product of its digits is 24000, while the sum is 34.

The spelling of 12541216525 in words is "twelve billion, five hundred forty-one million, two hundred sixteen thousand, five hundred twenty-five".