12661525 has 6 divisors (see below), whose sum is σ = 15700322. Its totient is φ = 10129200.

The previous prime is 12661499. The next prime is 12661589. The reversal of 12661525 is 52516621.

It can be written as a sum of positive squares in 3 ways, for example, as 320356 + 12341169 = 566^2 + 3513^2 .

It is not a de Polignac number, because 12661525 - 2¹⁵ = 12628757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12661493 and 12661502.

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, 253206 + ... + 253255.

Almost surely, 2^12661525 is an apocalyptic number.

It is an amenable number.

12661525 is a deficient number, since it is larger than the sum of its proper divisors (3038797).

12661525 is an equidigital number, since it uses as much as digits as its factorization.

12661525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506471 (or 506466 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 12661525 is about 3558.3036688849. The cubic root of 12661525 is about 233.0748100450.

The spelling of 12661525 in words is "twelve million, six hundred sixty-one thousand, five hundred twenty-five".