11644643669999 has 4 divisors (see below), whose sum is σ = 11688919881936. Its totient is φ = 11600367458064.

The previous prime is 11644643669977. The next prime is 11644643670031. The reversal of 11644643669999 is 99996634644611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11644643669999 - 2²⁴ = 11644626892783 is a prime.

It is a super-2 number, since 2×11644643669999² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11644643669959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22138105574 + ... + 22138106099.

It is an arithmetic number, because the mean of its divisors is an integer number (2922229970484).

Almost surely, 2^{11644643669999} is an apocalyptic number.

11644643669999 is a deficient number, since it is larger than the sum of its proper divisors (44276211937).

11644643669999 is an equidigital number, since it uses as much as digits as its factorization.

11644643669999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44276211936.

The product of its digits is 1632586752, while the sum is 77.

The spelling of 11644643669999 in words is "eleven trillion, six hundred forty-four billion, six hundred forty-three million, six hundred sixty-nine thousand, nine hundred ninety-nine".