11567661 has 8 divisors (see below), whose sum is σ = 17626944. Its totient is φ = 6610080.

The previous prime is 11567659. The next prime is 11567669. The reversal of 11567661 is 16676511.

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

It is not a de Polignac number, because 11567661 - 2¹ = 11567659 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11567669) 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, 275400 + ... + 275441.

It is an arithmetic number, because the mean of its divisors is an integer number (2203368).

Almost surely, 2^11567661 is an apocalyptic number.

It is an amenable number.

11567661 is a deficient number, since it is larger than the sum of its proper divisors (6059283).

11567661 is an equidigital number, since it uses as much as digits as its factorization.

11567661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550851.

The product of its digits is 7560, while the sum is 33.

The square root of 11567661 is about 3401.1264310519. The cubic root of 11567661 is about 226.1596817038.

It can be divided in two parts, 115 and 67661, that added together give a palindrome (67776).

The spelling of 11567661 in words is "eleven million, five hundred sixty-seven thousand, six hundred sixty-one".