12661445 has 4 divisors (see below), whose sum is σ = 15193740. Its totient is φ = 10129152.

The previous prime is 12661433. The next prime is 12661469. The reversal of 12661445 is 54416621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54416621 = 7 ⋅7773803.

It can be written as a sum of positive squares in 2 ways, for example, as 5230369 + 7431076 = 2287^2 + 2726^2 .

It is a cyclic number.

It is not a de Polignac number, because 12661445 - 2⁶ = 12661381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266140 + ... + 1266149.

It is an arithmetic number, because the mean of its divisors is an integer number (3798435).

Almost surely, 2^12661445 is an apocalyptic number.

It is an amenable number.

12661445 is a deficient number, since it is larger than the sum of its proper divisors (2532295).

12661445 is an equidigital number, since it uses as much as digits as its factorization.

12661445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532294.

The product of its digits is 5760, while the sum is 29.

The square root of 12661445 is about 3558.2924275557. The cubic root of 12661445 is about 233.0743191609.

The spelling of 12661445 in words is "twelve million, six hundred sixty-one thousand, four hundred forty-five".