12445661 has 4 divisors (see below), whose sum is σ = 12621024. Its totient is φ = 12270300.

The previous prime is 12445651. The next prime is 12445679. The reversal of 12445661 is 16654421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16654421 = 7 ⋅2379203.

It is a cyclic number.

It is not a de Polignac number, because 12445661 - 2⁶ = 12445597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12445651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87575 + ... + 87716.

It is an arithmetic number, because the mean of its divisors is an integer number (3155256).

Almost surely, 2^12445661 is an apocalyptic number.

It is an amenable number.

12445661 is a deficient number, since it is larger than the sum of its proper divisors (175363).

12445661 is an equidigital number, since it uses as much as digits as its factorization.

12445661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175362.

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

The square root of 12445661 is about 3527.8408410811. The cubic root of 12445661 is about 231.7426608050.

The spelling of 12445661 in words is "twelve million, four hundred forty-five thousand, six hundred sixty-one".