12665765 has 24 divisors (see below), whose sum is σ = 18726552. Its totient is φ = 8171520.

The previous prime is 12665743. The next prime is 12665771. The reversal of 12665765 is 56756621.

It can be written as a sum of positive squares in 4 ways, for example, as 6385729 + 6280036 = 2527^2 + 2506^2 .

It is not a de Polignac number, because 12665765 - 2⁸ = 12665509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2645 + ... + 5685.

It is an arithmetic number, because the mean of its divisors is an integer number (780273).

Almost surely, 2^12665765 is an apocalyptic number.

It is an amenable number.

12665765 is a deficient number, since it is larger than the sum of its proper divisors (6060787).

12665765 is a wasteful number, since it uses less digits than its factorization.

12665765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077 (or 3070 counting only the distinct ones).

The product of its digits is 75600, while the sum is 38.

The square root of 12665765 is about 3558.8994085251. The cubic root of 12665765 is about 233.1008239442.

The spelling of 12665765 in words is "twelve million, six hundred sixty-five thousand, seven hundred sixty-five".