11665465123421 has 4 divisors (see below), whose sum is σ = 12067722541500. Its totient is φ = 11263207705344.

The previous prime is 11665465123349. The next prime is 11665465123441. The reversal of 11665465123421 is 12432156456611.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4613306875321 + 7052158248100 = 2147861^2 + 2655590^2 .

It is a cyclic number.

It is not a de Polignac number, because 11665465123421 - 2⁴² = 7267418612317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11665465123441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201128708996 + ... + 201128709053.

It is an arithmetic number, because the mean of its divisors is an integer number (3016930635375).

Almost surely, 2^{11665465123421} is an apocalyptic number.

It is an amenable number.

11665465123421 is a deficient number, since it is larger than the sum of its proper divisors (402257418079).

11665465123421 is an equidigital number, since it uses as much as digits as its factorization.

11665465123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402257418078.

The product of its digits is 1036800, while the sum is 47.

The spelling of 11665465123421 in words is "eleven trillion, six hundred sixty-five billion, four hundred sixty-five million, one hundred twenty-three thousand, four hundred twenty-one".