11506661 has 4 divisors (see below), whose sum is σ = 11551692. Its totient is φ = 11461632.

The previous prime is 11506643. The next prime is 11506679. The reversal of 11506661 is 16660511.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (11506643) and next prime (11506679).

It can be written as a sum of positive squares in 2 ways, for example, as 10042561 + 1464100 = 3169^2 + 1210^2 .

It is a cyclic number.

It is not a de Polignac number, because 11506661 - 2¹⁴ = 11490277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11506661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11506861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22130 + ... + 22643.

It is an arithmetic number, because the mean of its divisors is an integer number (2887923).

Almost surely, 2^11506661 is an apocalyptic number.

It is an amenable number.

11506661 is a deficient number, since it is larger than the sum of its proper divisors (45031).

11506661 is an equidigital number, since it uses as much as digits as its factorization.

11506661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45030.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 11506661 is about 3392.1469602598. The cubic root of 11506661 is about 225.7614432679.

It can be divided in two parts, 11506 and 661, that added together give a cube (12167 = 23³).

The spelling of 11506661 in words is "eleven million, five hundred six thousand, six hundred sixty-one".