1306642262561 has 2 divisors, whose sum is σ = 1306642262562. Its totient is φ = 1306642262560.

The previous prime is 1306642262501. The next prime is 1306642262573. The reversal of 1306642262561 is 1652622466031.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 832136206225 + 474506056336 = 912215^2 + 688844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306642262561 - 2¹⁰ = 1306642261537 is a prime.

It is not a weakly prime, because it can be changed into another prime (1306642262501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653321131280 + 653321131281.

It is an arithmetic number, because the mean of its divisors is an integer number (653321131281).

Almost surely, 2^{1306642262561} is an apocalyptic number.

It is an amenable number.

1306642262561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306642262561 is an equidigital number, since it uses as much as digits as its factorization.

1306642262561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 1306642262561 in words is "one trillion, three hundred six billion, six hundred forty-two million, two hundred sixty-two thousand, five hundred sixty-one".