1321615541263 has 2 divisors, whose sum is σ = 1321615541264. Its totient is φ = 1321615541262.

The previous prime is 1321615541251. The next prime is 1321615541269. The reversal of 1321615541263 is 3621455161231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321615541263 - 2³³ = 1313025606671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321615541269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660807770631 + 660807770632.

It is an arithmetic number, because the mean of its divisors is an integer number (660807770632).

Almost surely, 2^{1321615541263} is an apocalyptic number.

1321615541263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321615541263 is an equidigital number, since it uses as much as digits as its factorization.

1321615541263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 40.

The spelling of 1321615541263 in words is "one trillion, three hundred twenty-one billion, six hundred fifteen million, five hundred forty-one thousand, two hundred sixty-three".