266660565246666 has 24 divisors (see below), whose sum is σ = 599163245370144. Its totient is φ = 88886855082060.

The previous prime is 266660565246643. The next prime is 266660565246703. The reversal of 266660565246666 is 666642565066662.

It is a super-3 number, since 3×266660565246666³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 266660565246594 and 266660565246603.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 274342144830 + ... + 274342145801.

It is an arithmetic number, because the mean of its divisors is an integer number (24965135223756).

Almost surely, 2^{266660565246666} is an apocalyptic number.

266660565246666 is an abundant number, since it is smaller than the sum of its proper divisors (332502680123478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266660565246666 is an equidigital number, since it uses as much as digits as its factorization.

266660565246666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548684290648 (or 548684290636 counting only the distinct ones).

The product of its (nonzero) digits is 4031078400, while the sum is 72.

The spelling of 266660565246666 in words is "two hundred sixty-six trillion, six hundred sixty billion, five hundred sixty-five million, two hundred forty-six thousand, six hundred sixty-six".