1281066706691 has 2 divisors, whose sum is σ = 1281066706692. Its totient is φ = 1281066706690.

The previous prime is 1281066706657. The next prime is 1281066706769. The reversal of 1281066706691 is 1966076601821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1281066706691 - 2⁶ = 1281066706627 is a prime.

It is a super-2 number, since 2×1281066706691² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1281066706651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640533353345 + 640533353346.

It is an arithmetic number, because the mean of its divisors is an integer number (640533353346).

Almost surely, 2^{1281066706691} is an apocalyptic number.

1281066706691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281066706691 is an equidigital number, since it uses as much as digits as its factorization.

1281066706691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 1281066706691 in words is "one trillion, two hundred eighty-one billion, sixty-six million, seven hundred six thousand, six hundred ninety-one".