11665456423 has 4 divisors (see below), whose sum is σ = 12351659760. Its totient is φ = 10979253088.

The previous prime is 11665456379. The next prime is 11665456463. The reversal of 11665456423 is 32465456611.

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 11665456423 - 2⁹ = 11665455911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11665456423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11665456463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343101643 + ... + 343101676.

It is an arithmetic number, because the mean of its divisors is an integer number (3087914940).

Almost surely, 2^11665456423 is an apocalyptic number.

11665456423 is a deficient number, since it is larger than the sum of its proper divisors (686203337).

11665456423 is an equidigital number, since it uses as much as digits as its factorization.

11665456423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686203336.

The product of its digits is 518400, while the sum is 43.

The spelling of 11665456423 in words is "eleven billion, six hundred sixty-five million, four hundred fifty-six thousand, four hundred twenty-three".