266781961007 has 2 divisors, whose sum is σ = 266781961008. Its totient is φ = 266781961006.

The previous prime is 266781961001. The next prime is 266781961063. The reversal of 266781961007 is 700169187662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266781961007 - 2¹⁸ = 266781698863 is a prime.

It is a super-2 number, since 2×266781961007² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266781961007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266781961001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133390980503 + 133390980504.

It is an arithmetic number, because the mean of its divisors is an integer number (133390980504).

Almost surely, 2^266781961007 is an apocalyptic number.

266781961007 is a deficient number, since it is larger than the sum of its proper divisors (1).

266781961007 is an equidigital number, since it uses as much as digits as its factorization.

266781961007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 266781961007 in words is "two hundred sixty-six billion, seven hundred eighty-one million, nine hundred sixty-one thousand, seven".