266781961087 has 2 divisors, whose sum is σ = 266781961088. Its totient is φ = 266781961086.

The previous prime is 266781961073. The next prime is 266781961097. The reversal of 266781961087 is 780169187662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266781961087 is a prime.

It is a super-2 number, since 2×266781961087² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266781961007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133390980543 + 133390980544.

It is an arithmetic number, because the mean of its divisors is an integer number (133390980544).

Almost surely, 2^266781961087 is an apocalyptic number.

266781961087 is a deficient number, since it is larger than the sum of its proper divisors (1).

266781961087 is an equidigital number, since it uses as much as digits as its factorization.

266781961087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12192768, while the sum is 61.

The spelling of 266781961087 in words is "two hundred sixty-six billion, seven hundred eighty-one million, nine hundred sixty-one thousand, eighty-seven".