266909576641 has 2 divisors, whose sum is σ = 266909576642. Its totient is φ = 266909576640.

The previous prime is 266909576597. The next prime is 266909576671. The reversal of 266909576641 is 146675909662.

266909576641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189516562225 + 77393014416 = 435335^2 + 278196^2 .

It is a cyclic number.

It is not a de Polignac number, because 266909576641 - 2⁷ = 266909576513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 266909576641.

It is not a weakly prime, because it can be changed into another prime (266909576671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133454788320 + 133454788321.

It is an arithmetic number, because the mean of its divisors is an integer number (133454788321).

Almost surely, 2^266909576641 is an apocalyptic number.

It is an amenable number.

266909576641 is a deficient number, since it is larger than the sum of its proper divisors (1).

266909576641 is an equidigital number, since it uses as much as digits as its factorization.

266909576641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 266909576641 in words is "two hundred sixty-six billion, nine hundred nine million, five hundred seventy-six thousand, six hundred forty-one".