266212261 has 8 divisors (see below), whose sum is σ = 307661760. Its totient is φ = 225617568.

The previous prime is 266212241. The next prime is 266212313. The reversal of 266212261 is 162212662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 266212261 - 2⁵ = 266212229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266212241) 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 in 7 ways as a sum of consecutive naturals, for example, 213031 + ... + 214276.

It is an arithmetic number, because the mean of its divisors is an integer number (38457720).

Almost surely, 2^266212261 is an apocalyptic number.

It is an amenable number.

266212261 is a deficient number, since it is larger than the sum of its proper divisors (41449499).

266212261 is an equidigital number, since it uses as much as digits as its factorization.

266212261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427403.

The product of its digits is 3456, while the sum is 28.

The square root of 266212261 is about 16316.0124111255. The cubic root of 266212261 is about 643.2937786688.

It can be divided in two parts, 26621 and 2261, that added together give a palindrome (28882).

The spelling of 266212261 in words is "two hundred sixty-six million, two hundred twelve thousand, two hundred sixty-one".