266105242206666 has 96 divisors (see below), whose sum is σ = 605854619435520. Its totient is φ = 87526560716784.

The previous prime is 266105242206647. The next prime is 266105242206743. The reversal of 266105242206666 is 666602242501662.

It is a super-3 number, since 3×266105242206666³ (a number of 44 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 in 47 ways as a sum of consecutive naturals, for example, 29190345 + ... + 37206003.

It is an arithmetic number, because the mean of its divisors is an integer number (6310985619120).

Almost surely, 2^{266105242206666} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266105242206666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302927309717760).

266105242206666 is an abundant number, since it is smaller than the sum of its proper divisors (339749377228854).

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

266105242206666 is an equidigital number, since it uses as much as digits as its factorization.

266105242206666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8016582 (or 8016570 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 54.

The spelling of 266105242206666 in words is "two hundred sixty-six trillion, one hundred five billion, two hundred forty-two million, two hundred six thousand, six hundred sixty-six".