12766505 has 4 divisors (see below), whose sum is σ = 15319812. Its totient is φ = 10213200.

The previous prime is 12766483. The next prime is 12766519. The reversal of 12766505 is 50566721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50566721 = 17 ⋅2974513.

It can be written as a sum of positive squares in 2 ways, for example, as 2027776 + 10738729 = 1424^2 + 3277^2 .

It is not a de Polignac number, because 12766505 - 2⁶ = 12766441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1276646 + ... + 1276655.

It is an arithmetic number, because the mean of its divisors is an integer number (3829953).

Almost surely, 2^12766505 is an apocalyptic number.

It is an amenable number.

12766505 is a deficient number, since it is larger than the sum of its proper divisors (2553307).

12766505 is an equidigital number, since it uses as much as digits as its factorization.

12766505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553306.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 12766505 is about 3573.0246290783. The cubic root of 12766505 is about 233.7171992066.

The spelling of 12766505 in words is "twelve million, seven hundred sixty-six thousand, five hundred five".