1165663 has 8 divisors (see below), whose sum is σ = 1238400. Its totient is φ = 1094808.

The previous prime is 1165643. The next prime is 1165667. The reversal of 1165663 is 3665611.

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 1165663 - 2¹⁷ = 1034591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 928 + ... + 1786.

It is an arithmetic number, because the mean of its divisors is an integer number (154800).

2^1165663 is an apocalyptic number.

1165663 is a deficient number, since it is larger than the sum of its proper divisors (72737).

1165663 is an equidigital number, since it uses as much as digits as its factorization.

1165663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941.

The product of its digits is 3240, while the sum is 28.

The square root of 1165663 is about 1079.6587423811. The cubic root of 1165663 is about 105.2424631115.

The spelling of 1165663 in words is "one million, one hundred sixty-five thousand, six hundred sixty-three".