266676666221 has 16 divisors (see below), whose sum is σ = 307610853504. Its totient is φ = 226460712384.

The previous prime is 266676666199. The next prime is 266676666227. The reversal of 266676666221 is 122666676662.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266676666221 is a prime.

It is a super-3 number, since 3×266676666221³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266676666227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6950 + ... + 730343.

It is an arithmetic number, because the mean of its divisors is an integer number (19225678344).

Almost surely, 2^266676666221 is an apocalyptic number.

It is an amenable number.

266676666221 is a deficient number, since it is larger than the sum of its proper divisors (40934187283).

266676666221 is a wasteful number, since it uses less digits than its factorization.

266676666221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737780.

The product of its digits is 15676416, while the sum is 56.

The spelling of 266676666221 in words is "two hundred sixty-six billion, six hundred seventy-six million, six hundred sixty-six thousand, two hundred twenty-one".