266641222 has 4 divisors (see below), whose sum is σ = 399961836. Its totient is φ = 133320610.

The previous prime is 266641213. The next prime is 266641229. The reversal of 266641222 is 222146662.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266641229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66660304 + ... + 66660307.

It is an arithmetic number, because the mean of its divisors is an integer number (99990459).

Almost surely, 2^266641222 is an apocalyptic number.

266641222 is a deficient number, since it is larger than the sum of its proper divisors (133320614).

266641222 is a wasteful number, since it uses less digits than its factorization.

266641222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133320613.

The product of its digits is 13824, while the sum is 31.

The square root of 266641222 is about 16329.1525193440. The cubic root of 266641222 is about 643.6391169563.

Adding to 266641222 its reverse (222146662), we get a palindrome (488787884).

The spelling of 266641222 in words is "two hundred sixty-six million, six hundred forty-one thousand, two hundred twenty-two".