11550661 has 4 divisors (see below), whose sum is σ = 11768652. Its totient is φ = 11332672.

The previous prime is 11550659. The next prime is 11550677. The reversal of 11550661 is 16605511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3744225 + 7806436 = 1935^2 + 2794^2 .

It is not a de Polignac number, because 11550661 - 2¹ = 11550659 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 (11550601) 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 3 ways as a sum of consecutive naturals, for example, 108916 + ... + 109021.

It is an arithmetic number, because the mean of its divisors is an integer number (2942163).

Almost surely, 2^11550661 is an apocalyptic number.

It is an amenable number.

11550661 is a deficient number, since it is larger than the sum of its proper divisors (217991).

11550661 is an equidigital number, since it uses as much as digits as its factorization.

11550661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217990.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 11550661 is about 3398.6263401557. The cubic root of 11550661 is about 226.0488382198.

The spelling of 11550661 in words is "eleven million, five hundred fifty thousand, six hundred sixty-one".