266288251 has 4 divisors (see below), whose sum is σ = 266461272. Its totient is φ = 266115232.

The previous prime is 266288203. The next prime is 266288261. The reversal of 266288251 is 152882662.

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

It is a cyclic number.

It is not a de Polignac number, because 266288251 - 2²¹ = 264191099 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266288261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84181 + ... + 87286.

It is an arithmetic number, because the mean of its divisors is an integer number (66615318).

Almost surely, 2^266288251 is an apocalyptic number.

266288251 is a deficient number, since it is larger than the sum of its proper divisors (173021).

266288251 is a wasteful number, since it uses less digits than its factorization.

266288251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173020.

The product of its digits is 92160, while the sum is 40.

The square root of 266288251 is about 16318.3409389558. The cubic root of 266288251 is about 643.3549820153.

The spelling of 266288251 in words is "two hundred sixty-six million, two hundred eighty-eight thousand, two hundred fifty-one".