11644644261 has 4 divisors (see below), whose sum is σ = 15526192352. Its totient is φ = 7763096172.

The previous prime is 11644644259. The next prime is 11644644281. The reversal of 11644644261 is 16244644611.

11644644261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 11644644261 - 2¹ = 11644644259 is a prime.

It is a super-3 number, since 3×11644644261³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11644644281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1940774041 + ... + 1940774046.

It is an arithmetic number, because the mean of its divisors is an integer number (3881548088).

Almost surely, 2^11644644261 is an apocalyptic number.

It is an amenable number.

11644644261 is a deficient number, since it is larger than the sum of its proper divisors (3881548091).

11644644261 is an equidigital number, since it uses as much as digits as its factorization.

11644644261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881548090.

The product of its digits is 110592, while the sum is 39.

The spelling of 11644644261 in words is "eleven billion, six hundred forty-four million, six hundred forty-four thousand, two hundred sixty-one".