12665977 has 4 divisors (see below), whose sum is σ = 12679540. Its totient is φ = 12652416.

The previous prime is 12665959. The next prime is 12665987. The reversal of 12665977 is 77956621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9554281 + 3111696 = 3091^2 + 1764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12665977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12665927) 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, 5268 + ... + 7285.

It is an arithmetic number, because the mean of its divisors is an integer number (3169885).

Almost surely, 2^12665977 is an apocalyptic number.

It is an amenable number.

12665977 is a deficient number, since it is larger than the sum of its proper divisors (13563).

12665977 is a wasteful number, since it uses less digits than its factorization.

12665977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13562.

The product of its digits is 158760, while the sum is 43.

The square root of 12665977 is about 3558.9291928893. The cubic root of 12665977 is about 233.1021244867.

It can be divided in two parts, 126659 and 77, that added together give a square (126736 = 356²).

The spelling of 12665977 in words is "twelve million, six hundred sixty-five thousand, nine hundred seventy-seven".