1266665 has 8 divisors (see below), whose sum is σ = 1545288. Its totient is φ = 996480.

The previous prime is 1266631. The next prime is 1266677. The reversal of 1266665 is 5666621.

It can be written as a sum of positive squares in 4 ways, for example, as 123904 + 1142761 = 352^2 + 1069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1266665 - 2⁸ = 1266409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1772 + ... + 2381.

It is an arithmetic number, because the mean of its divisors is an integer number (193161).

2^1266665 is an apocalyptic number.

It is an amenable number.

1266665 is a deficient number, since it is larger than the sum of its proper divisors (278623).

1266665 is an equidigital number, since it uses as much as digits as its factorization.

1266665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4219.

The product of its digits is 12960, while the sum is 32.

The square root of 1266665 is about 1125.4621273059. The cubic root of 1266665 is about 108.1983380969.

The spelling of 1266665 in words is "one million, two hundred sixty-six thousand, six hundred sixty-five".