1326555126613 has 4 divisors (see below), whose sum is σ = 1327768810348. Its totient is φ = 1325341442880.

The previous prime is 1326555126601. The next prime is 1326555126643. The reversal of 1326555126613 is 3166215556231.

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 1004320656964 + 322234469649 = 1002158^2 + 567657^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326555126613 - 2⁵ = 1326555126581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326555126643) 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, 606840228 + ... + 606842413.

It is an arithmetic number, because the mean of its divisors is an integer number (331942202587).

Almost surely, 2^{1326555126613} is an apocalyptic number.

It is an amenable number.

1326555126613 is a deficient number, since it is larger than the sum of its proper divisors (1213683735).

1326555126613 is a wasteful number, since it uses less digits than its factorization.

1326555126613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213683734.

The product of its digits is 972000, while the sum is 46.

The spelling of 1326555126613 in words is "one trillion, three hundred twenty-six billion, five hundred fifty-five million, one hundred twenty-six thousand, six hundred thirteen".