266565557780551 has 2 divisors, whose sum is σ = 266565557780552. Its totient is φ = 266565557780550.

The previous prime is 266565557780371. The next prime is 266565557780603. The reversal of 266565557780551 is 155087755565662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266565557780551 - 2⁴¹ = 264366534524999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266565557780651) 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, 133282778890275 + 133282778890276.

It is an arithmetic number, because the mean of its divisors is an integer number (133282778890276).

Almost surely, 2^{266565557780551} is an apocalyptic number.

266565557780551 is a deficient number, since it is larger than the sum of its proper divisors (1).

266565557780551 is an equidigital number, since it uses as much as digits as its factorization.

266565557780551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646000000, while the sum is 73.

The spelling of 266565557780551 in words is "two hundred sixty-six trillion, five hundred sixty-five billion, five hundred fifty-seven million, seven hundred eighty thousand, five hundred fifty-one".