1326666553097 has 2 divisors, whose sum is σ = 1326666553098. Its totient is φ = 1326666553096.

The previous prime is 1326666553073. The next prime is 1326666553237. The reversal of 1326666553097 is 7903556666231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 793205765641 + 533460787456 = 890621^2 + 730384^2 .

It is an emirp because it is prime and its reverse (7903556666231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1326666553097 - 2¹⁸ = 1326666290953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1326666553027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663333276548 + 663333276549.

It is an arithmetic number, because the mean of its divisors is an integer number (663333276549).

Almost surely, 2^{1326666553097} is an apocalyptic number.

It is an amenable number.

1326666553097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326666553097 is an equidigital number, since it uses as much as digits as its factorization.

1326666553097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36741600, while the sum is 59.

The spelling of 1326666553097 in words is "one trillion, three hundred twenty-six billion, six hundred sixty-six million, five hundred fifty-three thousand, ninety-seven".