1326666553073 has 2 divisors, whose sum is σ = 1326666553074. Its totient is φ = 1326666553072.

The previous prime is 1326666553061. The next prime is 1326666553097. The reversal of 1326666553073 is 3703556666231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1285157787904 + 41508765169 = 1133648^2 + 203737^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326666553073 - 2⁴ = 1326666553057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1326666553013) 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 as a sum of consecutive naturals, namely, 663333276536 + 663333276537.

It is an arithmetic number, because the mean of its divisors is an integer number (663333276537).

Almost surely, 2^{1326666553073} is an apocalyptic number.

It is an amenable number.

1326666553073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326666553073 is an equidigital number, since it uses as much as digits as its factorization.

1326666553073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12247200, while the sum is 53.

The spelling of 1326666553073 in words is "one trillion, three hundred twenty-six billion, six hundred sixty-six million, five hundred fifty-three thousand, seventy-three".