11505665 has 8 divisors (see below), whose sum is σ = 13827240. Its totient is φ = 9190912.

The previous prime is 11505629. The next prime is 11505667. The reversal of 11505665 is 56650511.

It is a Cunningham number, because it is equal to 3392²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 11505664 = 1^2 + 3392^2 .

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 11505665 - 2¹² = 11501569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11505667) 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, 3407 + ... + 5883.

It is an arithmetic number, because the mean of its divisors is an integer number (1728405).

It is a Proth number, since it is equal to 2809 ⋅ 2¹² + 1 and 2809 < 2¹².

Almost surely, 2^11505665 is an apocalyptic number.

It is an amenable number.

11505665 is a deficient number, since it is larger than the sum of its proper divisors (2321575).

11505665 is an equidigital number, since it uses as much as digits as its factorization.

11505665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 11505665 is about 3392.0001474057. Note that the first 3 decimals coincide. The cubic root of 11505665 is about 225.7549292182.

The spelling of 11505665 in words is "eleven million, five hundred five thousand, six hundred sixty-five".