11805661 has 8 divisors (see below), whose sum is σ = 13557824. Its totient is φ = 10069920.

The previous prime is 11805641. The next prime is 11805709. The reversal of 11805661 is 16650811.

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

It is not a de Polignac number, because 11805661 - 2⁷ = 11805533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11805641) 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, 2520 + ... + 5473.

It is an arithmetic number, because the mean of its divisors is an integer number (1694728).

Almost surely, 2^11805661 is an apocalyptic number.

It is an amenable number.

11805661 is a deficient number, since it is larger than the sum of its proper divisors (1752163).

11805661 is an equidigital number, since it uses as much as digits as its factorization.

11805661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8211.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 11805661 is about 3435.9366990677. The cubic root of 11805661 is about 227.7002125921.

The spelling of 11805661 in words is "eleven million, eight hundred five thousand, six hundred sixty-one".