1326666553173 has 12 divisors (see below), whose sum is σ = 2063703527340. Its totient is φ = 816410186496.

The previous prime is 1326666553097. The next prime is 1326666553237. The reversal of 1326666553173 is 3713556666231.

It can be written as a sum of positive squares in 2 ways, for example, as 153556610769 + 1173109942404 = 391863^2 + 1083102^2 .

It is not a de Polignac number, because 1326666553173 - 2¹⁸ = 1326666291029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326666553073) 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 11 ways as a sum of consecutive naturals, for example, 5669515068 + ... + 5669515301.

It is an arithmetic number, because the mean of its divisors is an integer number (171975293945).

Almost surely, 2^{1326666553173} is an apocalyptic number.

1326666553173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1326666553173 is a deficient number, since it is larger than the sum of its proper divisors (737036974167).

1326666553173 is a wasteful number, since it uses less digits than its factorization.

1326666553173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11339030388 (or 11339030385 counting only the distinct ones).

The product of its digits is 12247200, while the sum is 54.

The spelling of 1326666553173 in words is "one trillion, three hundred twenty-six billion, six hundred sixty-six million, five hundred fifty-three thousand, one hundred seventy-three".