11644640771 has 8 divisors (see below), whose sum is σ = 11925855984. Its totient is φ = 11366714880.

The previous prime is 11644640743. The next prime is 11644640849. The reversal of 11644640771 is 17704644611.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11644640771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11644640731) 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, 815165 + ... + 829326.

It is an arithmetic number, because the mean of its divisors is an integer number (1490731998).

Almost surely, 2^11644640771 is an apocalyptic number.

11644640771 is a deficient number, since it is larger than the sum of its proper divisors (281215213).

11644640771 is an equidigital number, since it uses as much as digits as its factorization.

11644640771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644661.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 11644640771 in words is "eleven billion, six hundred forty-four million, six hundred forty thousand, seven hundred seventy-one".