12665261 has 4 divisors (see below), whose sum is σ = 14474592. Its totient is φ = 10855932.

The previous prime is 12665243. The next prime is 12665293. The reversal of 12665261 is 16256621.

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: 16256621 = 821 ⋅19801.

It is a cyclic number.

It is not a de Polignac number, because 12665261 - 2⁶ = 12665197 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 (12665461) 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, 904655 + ... + 904668.

It is an arithmetic number, because the mean of its divisors is an integer number (3618648).

Almost surely, 2^12665261 is an apocalyptic number.

It is an amenable number.

12665261 is a deficient number, since it is larger than the sum of its proper divisors (1809331).

12665261 is an equidigital number, since it uses as much as digits as its factorization.

12665261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809330.

The product of its digits is 4320, while the sum is 29.

The square root of 12665261 is about 3558.8285994130. The cubic root of 12665261 is about 233.0977320300.

The spelling of 12665261 in words is "twelve million, six hundred sixty-five thousand, two hundred sixty-one".