11644661 has 4 divisors (see below), whose sum is σ = 13308192. Its totient is φ = 9981132.

The previous prime is 11644637. The next prime is 11644691. The reversal of 11644661 is 16644611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16644611 = 1151 ⋅14461.

It is not a de Polignac number, because 11644661 - 2⁶ = 11644597 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 (11644621) 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, 831755 + ... + 831768.

It is an arithmetic number, because the mean of its divisors is an integer number (3327048).

Almost surely, 2^11644661 is an apocalyptic number.

It is an amenable number.

11644661 is a deficient number, since it is larger than the sum of its proper divisors (1663531).

11644661 is an equidigital number, since it uses as much as digits as its factorization.

11644661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663530.

The product of its digits is 3456, while the sum is 29.

The square root of 11644661 is about 3412.4274351259. The cubic root of 11644661 is about 226.6603821306.

The spelling of 11644661 in words is "eleven million, six hundred forty-four thousand, six hundred sixty-one".