1326661665353 has 4 divisors (see below), whose sum is σ = 1326664960128. Its totient is φ = 1326658370580.

The previous prime is 1326661665319. The next prime is 1326661665403. The reversal of 1326661665353 is 3535661666231.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1326661665353 - 2⁶ = 1326661665289 is a prime.

It is a super-2 number, since 2×1326661665353² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1326661665295 and 1326661665304.

It is not an unprimeable number, because it can be changed into a prime (1326661695353) 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, 943013 + ... + 1882178.

It is an arithmetic number, because the mean of its divisors is an integer number (331666240032).

Almost surely, 2^{1326661665353} is an apocalyptic number.

It is an amenable number.

1326661665353 is a deficient number, since it is larger than the sum of its proper divisors (3294775).

1326661665353 is an equidigital number, since it uses as much as digits as its factorization.

1326661665353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294774.

The product of its digits is 10497600, while the sum is 53.

The spelling of 1326661665353 in words is "one trillion, three hundred twenty-six billion, six hundred sixty-one million, six hundred sixty-five thousand, three hundred fifty-three".