266211856 has 15 divisors (see below), whose sum is σ = 515911951. Its totient is φ = 133073296.

The previous prime is 266211833. The next prime is 266211859. The reversal of 266211856 is 658112662.

The square root of 266211856 is 16316.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266211859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 63225 + ... + 67303.

Almost surely, 2^266211856 is an apocalyptic number.

266211856 is the 16316-th square number.

It is an amenable number.

266211856 is a deficient number, since it is larger than the sum of its proper divisors (249700095).

266211856 is an frugal number, since it uses more digits than its factorization.

266211856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8166 (or 4081 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The cubic root of 266211856 is about 643.2934524453.

The spelling of 266211856 in words is "two hundred sixty-six million, two hundred eleven thousand, eight hundred fifty-six".