266044020665566 has 16 divisors (see below), whose sum is σ = 468832819634928. Its totient is φ = 111626861817600.

The previous prime is 266044020665557. The next prime is 266044020665617. The reversal of 266044020665566 is 665566020440662.

It is a self number, because there is not a number n which added to its sum of digits gives 266044020665566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465111923955 + ... + 465111924526.

It is an arithmetic number, because the mean of its divisors is an integer number (29302051227183).

Almost surely, 2^{266044020665566} is an apocalyptic number.

266044020665566 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

266044020665566 is a deficient number, since it is larger than the sum of its proper divisors (202788798969362).

266044020665566 is a wasteful number, since it uses less digits than its factorization.

266044020665566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930223848507.

The product of its (nonzero) digits is 74649600, while the sum is 58.

The spelling of 266044020665566 in words is "two hundred sixty-six trillion, forty-four billion, twenty million, six hundred sixty-five thousand, five hundred sixty-six".