1266663 has 8 divisors (see below), whose sum is σ = 1709568. Its totient is φ = 834104.

The previous prime is 1266631. The next prime is 1266677. The reversal of 1266663 is 3666621.

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

It is a cyclic number.

It is not a de Polignac number, because 1266663 - 2⁵ = 1266631 is a prime.

1266663 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1266663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2295 + ... + 2792.

It is an arithmetic number, because the mean of its divisors is an integer number (213696).

2^1266663 is an apocalyptic number.

1266663 is a deficient number, since it is larger than the sum of its proper divisors (442905).

1266663 is an equidigital number, since it uses as much as digits as its factorization.

1266663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5173.

The product of its digits is 7776, while the sum is 30.

The square root of 1266663 is about 1125.4612387817. The cubic root of 1266663 is about 108.1982811503.

The spelling of 1266663 in words is "one million, two hundred sixty-six thousand, six hundred sixty-three".